Works really well. Holds about 12-15 1 inch stones comfortably. Be aware that tumbling takes 3 to 6 days non stop for each grit cycle (there are 4 cycles). So expect to wait 12 days or more for good results. The results are amazing though. Not particularly loud but it could compete with a dishwasher. We put ours in the laundry room because it was putting us to sleep. Excellent if youre a fan of white noise though. The manual seems to think our unit has a dial where we can set rhe number of days but it doesnt. Nevertheless we are happy with it.