I would say they are worth the money. Go for it. I took a blunted Pampered Chef kitchen knife from completely dull to razor sharp in about an hour (of bumbling and repairing mistakes LOL) heavy grinding. If you have a severely damaged blade, grab one of those cheesey two sided stones from Harbor Freight to do your heavy grinding. From there these stones will work very well.
Whichever method you choose, be it a waterstone (also known as a whetstone), or a pull-through (either V-shaped or ceramic wheels) it's important to regularly hone your knife with a honing steel, which we'll also cover below. You'll be pleased to hear that you won't have to reach for the stones too regularly – once every two or three months should suffice. 
This 600/1,000 grit is my second Unimi knife sharpener, the first is 2,000/6,000 grit and I love them both. Both stones together produce very sharp and well polished knives that reduce the cutting effort and save time in the kitchen. I particularly appreciate that the manufacture printed the grit number on the side of each stone - that helps use the different grits in the proper sequence from the coarser to the finer. The stone comes with a non-slip silicone/rubber base which is very handy.

Whetstone has two different sides of grain for sharpening and polishing knife edges. These softer Japanese stones have several advantages over harder stones. Because they are softer, they do not become glazed or loaded with detritus. Plus, they are lubricated effectively with water rather than oil, but can be used with either. Submerge the stone in water for about 5 - 10 minutes. Continue to apply water while sharpening with the Whetstone Cutlery Two sided Whetstone Sharpening Stone. The stone releases small particles during the sharpening process; this powder in combination with water allows the sharpening. After a while you will notice a small burr at the edge. Now repeat the same process on the other side of the blade. Finally, turn the stone over and repeat the procedure, this time using the finer grit of the stone. In order to remove the remaining burr, pull the blade at an angle over the stone. Rinse the stone and clean off the grinding residue. Clean your knife with hot water.
Cut a wine cork so that it measures .5 of an inch and use that as your visual guide. You can keep it at the end of your water stone and rest the spine of the knife on it so that you can see what that angle looks like. Now this is all pretty nifty but you still have to learn to move that knife over the water stone holding it at that angle, whether you chose 20 or 15 deg, making the template is the easy part, stabilizing that angle is where practice is crucial. You can hold the knife with that wine cork in place and that is the angle you want sharpen at but now that piece of cork has to go, you’re on your own. I have taught many many people to sharpen a knife and believe me, this particular part of the process is not as hard as many people believe! In fact as you start actually sharpening the knife you will become quite motivated to succeed because it isn’t as hard as you thought it would be. In time, you’ll learn that you don’t need or want to sharpen everything at 20 deg, but for the sake of building muscle memory it is a good place to start.
This is a good quality stone for a beginner looking to learn about hand sharpening knives and blades. It holds up well, especially for the price point. New sharpeners are prone to gouging and scratching stones, pushing too hard, etc, and this stone handles the abuse nicely. The no slip base is very effective at cementing the stone in place, which is a critical safety feature.
"How do I use this daunting metal rod?" I hear you ask. Well, it's not too hard, really. The best way for a beginner is to balance the steel on a surface with the tip secured by a damp tea towel. You want to get that angle right, whether it's around 15 degrees for a Japanese knife or 20 degrees on a German or French blade. Then swipe slowly down, away from you, making sure the whole blade is honed – around five swipes on each side should do. 
I enjoy these stones so much that the feedback is not a deterrent at all for me, I don’t even think about it. The results are always nothing but top notch, they deliver exactly what I want, some of the sharpest knives I have ever produced were sharpened on Shapton Glass stones. They may be thinner but they last a very long time, they are easy to maintain as well,
One more thing to consider before you proceed is if you would like to sharpen your knife freehand or use a guide such as the DMT Sharpening Guide. Your skill and experience in sharpening will help you decide on the method that's best for you. If you are experienced and comfortable with freehand sharpening, a knife guide may be unnecessary. On the other hand, a knife sharpening guide is an inexpensive and easy way to keep the angle consistent. If you have tried to sharpen before but never achieved the proper edge, we recommend using the sharpening guide. The guide can solve common mistakes in the sharpening process. If you choose to use a guide, please read our how-to for using the knife sharpening guide.
Practice holding the knife at a 20 degree angle. Most straight blades need to be sharpened at a 20 degree angle. To find the angle, hold the directly in front of you so it's straight up and down. This is 90 degrees. Tilt the knife halfway towards the table so it's at a 45 degree angle. Tilt the knife halfway again so it's about an inch (2.5 cm) above the table. This should be a 20 degree angle.[4]
Anova's been making sous vide circulators for over 10 years. The Nano takes all that know-how and packs it into a kitchen drawer-friendly package. Able to cook food perfectly, all the way through, with a temperature range of 32-197º F, it delivers outstanding results no matter what you're preparing. Bluetooth lets you check on the proceedings from afar and gives you access to over 1,000 recipes for every skill level, whether you're an accomplished chef or struggle to make instant ramen.
Removing the burr is fairly simple. You'll need a leather strop or block (this sort of thing), which is designed to catch the metal fibres from the knife. You could do it with a fibrous tea towel or some newspaper if you like, but I'd suggest going with leather to begin with. The motion is fairly similar to sharpening. Draw the knife over the leather, going away from the edge at roughly the same angle as when you sharpened. 
The Sunrise Pro doesn’t have the pedigree of some other knife sharpeners on our list but it performs as advertised and that’s all that matters. For a relative song you get to restore all the knives, steak knives, cleavers in your kitchen to near pristine condition. It’s easy to use and the nice strong suction cup on the bottom means you can put the band aids away.
Our large selection of stones from many well-known manufacturers will allow connoisseurs to find the ideal stone for their needs. Because all manufacturers formulate their stones to emphasize a different mix of qualities, and because these qualities can vary widely between different stones, most woodworkers choose stones from several manufacturers to build up an optimal set of sharpening stones. Then again, once you get to know the characteristics of certain types of stone, you may find one supplier who will provide all the stones you need. Sometimes this can be an advantage. But there is no one size that fits all; each stone must fit your needs and work style.
I really liked this whetstone! I had a Smith's pocket sharpener that could get my knife sharp enough for working around in the yard (I have an Opinel no.8). However, in doing a little research I found that the sharpener was only around 600 grit on the finest setting. So this BearMoo 1000/4000 grit looked like the perfect step up, and it turned out to be the perfect stone for me. The pictures are an accurate representation of what you get. The removable rubber base was helpful when switching from one side to the next, and it kept the stone from sliding around. The instructions say that the stone can work with either water or oil, but that water is preferred. It said to leave the stone soaking in water for five minutes, and the stone worked like a champ. I especially liked how the instructions gave you an approximate time of how long the stone takes to sharpen a knife -- it just helped give me an idea that it would take about 15-20 minutes on the 1000 grit side, and then another 10-15 minutes on the 4000 grit. Just turn on a TV show!
The word “Novaculite” is derived from the Latin word “novacula”, which means “razor stone” and is essentially a metamorphic, recrystallized, variety of Chert composed mostly of microcrystalline quartz that is found in the found in the Ouachita Mountains of Arkansas and Oklahoma and in the Marathon Uplift of  Deposited in the Devonian Period and the early Mississippian Subperiod some 410 to 325 million years ago and subjected to uplift and folding during the Ouachita orogeny of the Atokan Epoch (early Pennsylvanian Subperiod), Novaculite is a very tough stone that is resistant to erosion and thus, the various layers of Novaculite stand out as ridges in the Ouachita Mountains. Thus, due to both its availability and its composition, it has been mined since ancient times for use as arrowheads and spear heads as well as in more modern times for use as sharpening stones.

I recommend it as a lightweight alternative to larger stone for smaller knives. Leather necklace is comfortable and seems strong. I conditioned it for suppleness and swim with it on tightened as a choker. Stone is small, dog-tag size. I use it with water. Functional for small folder knives and multi-tools. Not useful for large fixed blades, since you can't make a long stroke. Small to grip. I use double-sided tape on one side to keep it in place on a flat rock. Not sure of grit, seems like around 1000. It took a while, but i got my old boy scout knife sharp.
A: That depends almost entirely on how often you use them. If you are a professional chef who uses his or her knives every day then you should hone them every time you use your knives. But honing has its limits and over time your edge is going to become dull no matter what. Therefore your knives will need to be sharpened at least several times a year. Some chefs, in fact, will use a whetstone on an almost daily basis in order to ensure their knives are always razor sharp. Most of us, however, are not professional chefs and may not even touch our kitchen knives for days at a time. In that case, it’s probably a good idea to hone the edge after every couple of uses and have your knives sharpened once a year.