Overall, for the money, a decent machine. Precision is not the word I'd use in describing this machine. However, it actually works. Once you get past the complacent nature of the instructions, you'll figure it out. My one complaint, (actually 2) is the difficulty in locating a seller for replacement blades. I finally found a store, on Amazon, who sell the exact wheel you'd need for this particular device. Type "5 inch Tapered Plain Resin Diamond Grinding Wheel", and you'll get "JIUNENG STORE". I'm ordering 2 wheels, as the original wheel chipped off the first day I used it. It still sharpens with a 1/4" piece missing from the wheels edge.My second complaint is from one of the saw blades I own (Freud) has very sharp angles on the teeth, so I was only able to sharpen one half of the sides of the teeth.
stefan_ny1 
