My biggest complaint is that the adjustment screw won't hold if not tightened properly. However, this leaves a groove in the shaft so that it no longer easily sticks to the left or right. However, the blade is strong and easy to sharpen, but so thick that it has to cut through an extra eighth of an inch of material to cut a hole. It seems the blade could be made thinner to make cutting easier. However, with many frustrating tweaks, it will eventually cut a hole.