We sell lots of the Lyman tumblers including this model as my best seller. I have only had a problem with one and that was the store model that I used to polish all the surplus brass we bought over the years. After several years and hundreds of hours of operation, the unit failed to vibrate anymore. I sent it back to Lyman and in about 6-8 weeks it came back with a new motor and is still purring great. Phil.