I use a Lyman Turbo that i've had for years that came with a kit i bought from a friend that was getting out of reloading. I use a mix of corncob / walnut media. I also add Lyman Turbo Bright polisher to the media and it has always done a good job cleaning and polishing brass. It does however take hours to clean things up especially if the brass is really dirty. I usually turn it on and do other stuff and periodically check the brass until it's clean. I know there's nicer and faster tumblers out there and the ones with the steel media look to really do a good job and fast but no more brass than i clean i can't justify buying one. Dillon does make good tumblers, i know several guys locally that use them.