Review on Marbles MR326 Two Sided Hand Sharpener by Richard Counts

The orange side was horribly concave (and the gray side convex) by about 1mm. I leveled both sides with a coarse DMT diamond stone under running water. In my case this wasn't a problem as I'm an avid DIY enthusiast and enjoy messing around with things and improving factory bugs. However, if you want something perfect (or even "acceptable") right away, remember that buying this stone is a calculated risk. I also noticed that for some reason the price of this item has magically doubled since I bought it about a week ago. Personally, I wouldn't pay more than ten dollars for this stone. This is a good trifle, however, as whetstones of this size are rare in round/washer tool form.