I have worn out tumblers- the Midway/Frankford Arsenal tumbler, The Harbor Freight is the same, a sleeve bearing motor, gets full of dust, fails. There's a couple other major brands that are basically the same tumbler with a different color bowl that have the same sleeve-bearing motor.
I run my tumblers constantly during brass season. I have had the best results from the Berry's tumblers (Also Cabelas and Midsouth Shooter Supply). Ball bearing oversized motor, heavy gauge cord with three prong plug, good switch, heavy gauge plastic, and I load 5# of media and 5# of brass in one load with a splurt of NuFinish from time to time. I have run my oldest Berry's for so far going on 4 years with only annual cleaning and a light oiling of the motor. I have standardized on the Berry's style tumbler completely for my nearly commercial operation.
#5 of brass is about 500- 40 S&W, 600- 9mm, 400- 45 auto, 350- .223 REM
--and I'm a guy who used to use a cement mixer! so I know tumbling!
The best deal right now is from the E.A.Brown company.
http://www.eabco.com/store/products...bler_Cleans_Polishes_Brass_Cases-2055-58.html
$49 plus reasonable $8.95 shipping. Cheaper by about $10 or more than even buying form Berry's direct. Only Cabelas (on sale and you pickup at the store) is cheaper.