Pros: looks like a nice toy before you plug it in
Cons: NOISY beyond belief, big waste of electricity, huge time commitment
Imagine a lawn mower running in your kitchen for 7-14 days STRAIGHT!!! Honestly, I can't tell you about the end result because we had to shut this thing off by day 10 and the rocks still needed more tumbling. My son who got this for his sixth birthday was so excited but even he realized how absolutely INSANE this toy was. Aside from the 24 hour a day NOISY motor and tumbling that was enough to make us all want to run away from home, imagine the electricity that was being wasted by this stupid thing?! So not only is it bad for your mental well being, it's bad for the earth. Horrible. Buy this toy for someone's child only if you secrectly hate his or her parents.