I have the ceramic Pioneer Pet fountain and use it for my cat with urinary problems. It took about a month before she wasn't scared of it, but now she absolutely loves it.
Since Riblet won't eat canned cat food, my vet said it was critical that she increase her water intake another way. This was the answer. The filters work great and are worth their weight in gold. Having the pet fountain has probably saved my hundreds of dollars in vet bills. I have been using the fountain and filters for over a year and won't stop anytime soon!