For a number of years I've been using the same Daisy sour cream container and Airsoft BBs for coating. It works well and reliably, but it's not fast because I can't really put that many bullets in the container without having them rub against each other and cause large bare spots. I'm looking at getting a something to do dry tumbling, but having little knowledge of vibratory tumblers I feel certain there are things that I wouldn't know to look for.
In my mind, I was imagining getting some additional BBs to make sure the tumbler was sufficiently buffered and then basically treating the thing like an automated sour cream container shaker. Is that basically what it looks like in practice? What should I look for or avoid in a tumbler?