I bought this and it does look like a good product. However, I was assuming that this equipment would emulate a belt sander and have a flat rider plate under the belt where sharpening takes place, thus resulting in a flat beveled edge on the knife. IT DOES NOT!! If you use this machine to sharpen your knives it will put a convex angle/ bevel on every knife you sharpen with it!! This means no touch up sharpening on your favorite stone or any other flat sharpening surfaces again....unless you regrind to a flat bevel again on all those same knives. I for one do NOT want to do this to all my knives! Again, give very close consideration before buying /using this. I never used this product and am returning it unused now that I realize about the edge bevel change. Hope this helps someone else out there be aware.