<<>> I bought one of these, and it works awesome. With that said, if you haven't shaved any imperfections or runs out of a paint job, in the pictures of this Amazon ad, they show it being used incorrectly. In the pictures it appears they're scraping by pushing the edge away from them and that's incorrect. You lean it over at about a 45° angle and you pull it towards you to shave runs and imperfections out of paint. If you have the edge perpendicular to the direction of travel, you usually will get some chatter. If you rotate the edge 15 or 20° in relation to the direction to travel, it will be completely smooth and chatter free. Awesome product and I just logged in to order another one so I can have one at work and at home.