Here is a review left by a customer on a product. Would you say he was satisfied or dissatisfied?
Title: It does the job... if you are patient and work slowly to get the angle right.
Review: What do you expect for the price. The side grooves that supposedly hold your chisel in place doesn't seem completely flat and square to the side of the blade, and seem too small to accomodate thicker chisels. If you have the cash, I would highly recommend the more expensive ones that give you more support for the blade as you try to adjust the angle.
