I was really on the fence about these. They tend to be super expensive & they seem to leak. This was such a great price, I decided to give it a shot. It worked really well. No leaks. Be super careful of the stone you get. Some stones can be toxic. See my list of toxic stones.
These seem to be the best all around. It’s the best price I’ve found them at & no mess. I don’t drink all my water out of it and I don’t ever let water sit in it. Every night it gets dumped out & dried out. Make sure you clean it regularly. As long as you let it completely dry- no yucky growth.