I can only add to what others have said that I looked everywhere and this sharpener represents one of the best products as well as the best value I have come across in years.I have rheumatoid arthritis and love cooking. But as my knives dull I find anymore I tend to avoid doing anything that requires sharp knives. Now I can enjoy cooking pretty much anything no matter how much chopping/cutting is entailed.I have some very nice higher end chef's knives because I assumed they would keep an edge for a long time. Well, I guess they do but when ya use them 2-4 meals/day, well, even the best get dull. Not anymore...sharp in just a few moments. The one knife I have not mastered sharpening are my 6" utility knives...but I am getting closer to perfect.Also bought using Amazon Prime so I got it the next day for $2...woohoo!! :)By far the most recommended product I have ever reviewed...