Bought based on positive reviews. It's certainly inexpensive. But given the price, it's not surprising that the screw threads are coarse rather than fine - it takes force to turn the screw to tighten the jaws even without a load. It feels like the grip flexes when I try to really clench my jaw. Which I would do if I didn't want the piece to move when clamped. The clamping system is thin stamped metal, the silicon pads of the clamping mechanism and jaws do not match the parts they are designed to cover and are very thin. If you don't care about any of that, then this is a good deal.