Product was good for the price but you get what you pay for. I have a small carpentry shop. I wanted to try. To see if it's worth it. When I first tried it, the only knife was accurate. When I tried the double rail cutter it was far from it. I had to replace the shims that came with the top and bottom knives to make them fit a knife nice and neatly. Overall not a bad product but if not right out of the box. You'll have to replace the gaskets until you can do it safely. I used a regular shim to fit to the correct thickness.