I'm a metalsmith with a busy shop. I use this tumbler daily, usually for more than 5-6 hours & it has exceeded my expectations. I've been through so many tumblers, most of which cost so much more but produced less than great results. My suggestions: Find a good place to position this "screamer" because it will get annoying, replace the shot it comes with w/stainless steel, & order replacement belts. The first 2 that the tumbler came with broke within the first 2 months for me, but the replacements have lasted at least 4-5 months. (I bought this over a year ago.) I really appreciate how quickly it works, especially on the bidirectional rotation setting.