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Title: The barrel will wear out.
Review: Someone put zero thought into the barrel of this product. You are tumbling rocks that will continue to grind down to a smooth nature. What about the container? It too must withstand the abuse of all those rocks rolling around day after day. We were only able to complete one cycle of rocks. When we went to do a second set about 3 days in we had sprung a massive hole and gray course grit was everywhere. I had a tumbler as a kid and tumbled many many sets of rocks. Never ever did my tumbler fail. This tumbler is made of softer plastic. As for the machine, it works great. The set is crap though due to the barrel which is a major component to the entire set.
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