I got the PetMate Fresh Flow fountain in last years auction, and it has proved very popular. It does occasionally stop working, making a hell of a racket when it does, but if I switch it off for half an hour, and make sure it's full, it starts working perfectly again. When it' running, the cats don;t try to drink from the tap, but if it's switched off they jump up to the kitchen sink and wait for me to start the tap dripping!