Dynabrade I use I also use costs 4 times more. Get what you pay for and it really works. It just sucks in more air, vibrates more and doesn't cut as quickly. Since time is money, the Dynabrade version will pay for itself in a short time, although it is 4 times more expensive. This version is more suitable for home use or hobbyists. The way it vibrates and makes more noise bouncing around. I think it won't even take 1/4 of the time. But I can't see that part yet. In general, for such a price, it works. However, I am giving 3 stars to make up for all the ridiculous 5 star reviews. Good example of "You get what you pay for"