Pros: Has a reservoir
Cons: When low on water, can be noisy; Must use a filter to prevent calcium deposits on the plastic
I've had a white Petmate for a number of years; maybe 8 years. I don't have any real issues with this fountain. It works well. The reservoir allows for additional water to help keep the bowl full.
I don't find it difficult to clean at all. I use a soap and water, a sponge and a small bottle brush. Takes a total of less than 5 minutes.
Unfortunately when the water gets low, the pump starts to make a sucking sound which lets you know that you need to put more water in. Which is good I guess, it prevents the pump from running dry and burning out.
I also notice that cat hair gets trapped at the back of the pump, which also causes the pump to make that noise.
Over all it's a pretty good pump. I've just switched to a Pioneer Stainless Steel Fountain at the recommendation of my Vet because my male cat has allergies and she thinks the plastic might be contributing to them. Had it not been for that, I would still be using the Petmate.