Depends what you are using the worm drive for. If you are cutting steel, they are a good tool, but if you are cutting plywood and you try to follow a chalk line, you end up with more curves than a beauty contest. They are utterly useless. The only way we could cut a straight line was to bump up against another sheet of plywood. This was a crew of professional carpenters working on a dam. Easily over a hundred years of experience. California framers like them because of their power, you drop it on the stud and it's cut, but framers are notoriously rough and ready carpenters. They are quick, though. A much better balanced and controllable saw is the copy of the old Skilsaw 535, the Makita 5007. You can build kitchen cabinets with them, many a carpenter has, including me.