I was first introduced to Shapton Glass stones in 2012. I’m a professional freehand knife sharpener and since that time the 220 grit stone is a staple in my inventory. I’ve probably gone through ten of these as I do so many knives. I’ll buy ten more if I’m lucky enough to have the opportunity. They excel at rapid bevel setting and Burr formation. Do not hesitate to buy one, you will love it. You don’t need to be a pro either, a brand new sharpener will benefit greatly by learning to use a 220 grit stone. Highly recommended.