I ran thru ( burned out) a couple of vibratory tumblers in a couple of years.
the company replaced it once, then refunded my money. ( I got tired of paying shipping back).
I considered the mechanical aspect of a machine that is designed to try and shake itself to death, then went with a roller tumbler for noise and longevity.
I bought a 2 drum unit from Harbor freight. It lasted about 3 years, with several belt replacements. I wound up just going with a HD rubber band and replacing it once a week or so.
I use walnut lizard litter, and I spice it up with bon ami cleanser when it quits cleaning.
The lizard litter is small enough it doesn't get stuck in the primer holes.
A used dryer sheet in with the mix picks up some of the dust and dirt for zero cost.
Next I am gonna buy a thumbler tumbler.