I've been using a frankford tumbler for close to 15 years. Of course, it probably only has 100 hrs on it. I don't tumble religiously. My uncle's burned up a couple of cabelas tumblers. He was struggling with one last weekend. Says the bearings in the motors aren't lubed and after a while they quit starting reliably, then at all. (I'm not a motor guy, I don't really know what that means) But he uses his tumblers a lot more than I do.