KoolStone is an Amazon native brand that sells the features the old American classics refuse to add: a brushless motor, three speed settings, a nine day digital timer and a memory function that resumes a cycle after a power cut. The Pro Max carries a 3 pound barrel and leans hard on noise reduction, which is the main complaint about tumblers running in a bedroom or apartment.
For apartment dwellers and gift buyers the electronics are genuinely useful, since a timer means the motor is not left grinding an empty slurry for an extra week. The trade off is long term parts support: belts and barrels come from the seller rather than from a lapidary dealer with 40 years of stock. Build quality is lighter than Lortone or Thumler's, so treat it as a hobby machine, not a commercial one.
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