If you follow the rules of a regular tumbler, this product I'd going to seem like it's broken out of the box. If the error message pops up and it won't run, the instructions will tell you it is undefiled. It is actually unbalanced. You will need plenty of filler to keep it running smoothly. And a little extra water than a normal tumbler needs. It tumbles very fast. Mess with the settings to find what works for you. Because it's direct drive and very weight sensitive, if there is too much space for the rocks to shift, the speed will change a lot. But as soon as you get used to how it runs and how to fill it to meet the needs of the machine it works extremely well. It doesn't seem like it heats up at all, and it is fairly quiet. I was very nervous the first day because it wasn't wanting to keep running (unbalanced) but as soon as I figured it out it works splendidly. Aquarium gravel and the ceramic round beads have worked the beat for filler. It really needs to be filler of various sizes. So don't give up if it doesn't seem like it's working straight away. There are some online videos that helped me troubleshoot. The instruction book didn't help at all.