Cost – While you can get a perfectly serviceable sharpening stick or stone sharpener for short money and some very high-quality tabletop manual 2 and 3-stage sharpeners for less than $50, high-quality mechanical systems will often run you $200 or even more. While that’s not so much money it’s likely to impact the quality of your life it is a lot to pay to keep a decent edge on your knives. While how much you ultimately pay for a sharpener is entirely up to you, you may want to consider your commitment to cooking and how often you are actually liable to use the device. If this is your first sharpener you might also want to consider learning how to sharpen a blade using a classic stick or stone sharpener first, before deciding if moving up to a mechanical sharpener is the right thing for you.
Understanding Grit: You’ll see a bunch of numbers being thrown around when discussing the grit of a sharpening stone. The number refers to the size of the grit. The larger the number, the finer the grit. A good beginner stone would be a two-sided stone with #400 and #1000 grit. The #400 grit is the courser stone for working out the nicks and imperfections, the #1000 grit is for refining.
However, due to limited natural deposits and extensive quarrying over the centuries, true, high quality, Japanese water stones are now few and far between and are very expensive. Thus, various companies are now producing synthetic Japanese Water Stones which generally have a more consistent composition and grit size than natural stones as well as often begin somewhat harder and thus, lasting a bit longer; not to mention being cheaper to purchase.
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. 
The purpose of this article is just to get you started on the right path and please note that this is just the way I do it, there are many gifted sharpeners out there who are eager to share their knowledge. (I am not calling myself a gifted sharpener by the way, I just have so much respect for many sharpeners so I’m calling them gifted, they call me Peter).
if you have regular kitchen knives it will not work- first its to deep and the blade does not stick out, not dinner knives but cooking knives. of all the knives i put in it only 1 was wide enough to stick out. the device does not hold the blades. all the blades tested fell out of it, even a hunting knife, maybe its for 1 type of knife and they are selling it as the must have tool for all.. that said sell something useless for a few bucks that most cant use, they got a few bucks that most will blow off and not worry about a refund.. DONT WASTE YOUR MONEY.
Why, then, do so many of us shy away from the task? To put it bluntly, it's because it's a rather daunting process for the beginner. Your image of knife sharpening may consist of a hyper-masculine chef slashing away violently at a steel rod (we're looking at you, Gordon). Conversely, you might have seen cooks meticulously and methodically stroking their blade up and down a Japanese waterstone with more intricate attention to detail than a Flemish landscape. 
Sharp knives make the culinary world go round but finding the best knife sharpener isn’t as simple as walking into the store (do people still walk into stores?) and grabbing the first sharpener that presents itself. There are different types of electric sharpeners, some that are straightforward and some whose sharpening process involves as many as 3 or 4 stages. If you’re looking to keep things simple by using a sharpening stone well, there are 3 different types of them as well – oil, water and diamond – and they each have their pros and cons. So it can be confusing.
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.