I like that this fountain came pre-assembled (even if you did have to take it apart to wash it and then put it back together--you at least knew how it was supposed to look in the end).  It has a low drone sound to it when you plug it in, so if you're a fan of white noise, that is nice.  It is easy to fill and use, though sometimes it does splash a little when you first plug it in.  My dog is still trying to figure it out, but if you have smarter pets than mine, I would recommend this fountain.