I own a drinkwell. http://www.vetventures.com/

I like it better than the petmate version because on the falling stream, which my kitten loves to drink from!

It does not splash , and is not very loud due to the design of it.
It uses a carbon filter that Im not sure if the PetMate one uses.

Not that it matters, but I believe PetMate originally used the same sort of design as Drinkwell, but they got sued because the free falling water was patented or something along those lines.
So PetMate had to redesign and they came up with the "slide" idea.