Midway replaced a very old dry vibrating type (there was a recall on them ) it still worked like a champ , Midway replaced it with a Frankford Arsenal , which looks very similar to the old. Been using it 4-5 years now and works just fine with Midway's treated walnut shell media.
I have a wet tumbler , Thumbler's Tumbler model B , used it to polish rocks in another hobby , but I find wet tumbling cases messy and then the extra drying step all to be a pain in the derriere .
Gary