After much examining of my kitties water fascination habits I plumped for the Petmate freshflow. I know someone else on here had terrible problems with theirs and gave up with it but mine love it. The drinkwell one does 'pour' water like a tap, whereas the petmate one sends it down a sort of slopey bit, so I'd have a look and see what in particular it is that your cats are fascinated by, and decide on type from there.