Convenience at a low price
This fountain is quite inexpensive compared to others I have seen elsewhere, and is convenient for those who are always on the run, such as myself.
It keeps the water cool and makes the water fresh (I add lukewarm water and minutes later it feels nice and cool). Rather than changing your pet's stagnated water daily, this fountain only needs to have water added whenever it starts becoming noisy due to the filter needing to be fully submerged. It includes a reservoir too which makes your water-filling less frequent and since the water is constantly circulating, you don't have to worry about it getting algae. The filter traps pieces of food your pet may accidentally kick into the water, so at that time it is a good idea to empty the water and clean it with hot water.

GET THE DELUXE MODEL
I had the deluxe model, and thought it wasn't working correctly, and I ordered this model, which did not work water gurgled out the sides. I cleaned the deluxe model with vinegar and it is working again! it keeps water circulating and my siamese and jack russell seem to drink more water .. get the deluxe model, you won't be sorry.

Love it, love it, love it!
This unit is so quiet and works great. I have a 3 pound Chihuahua and a 14 pound Chinese Crested Hairless and the size is perfect for the two of them. I highly recommend this to any petite to small animal owner.

Good but None Too Large
Buy a larger size than you think you'll need. I bought the Jumbo for a two-dog (one small, one large) household and wished that it came in a larger size. It required refilling every day or so. Other than that no real complaints. Reading the mostly positive reviews here leads me to believe that this product can have a long life. I haven't owned it long enough to form an opinion. The first unit I purchased experienced pump failure within a week and was exchanged for another, which did not fail. Maybe the pump is the potential weak point....

There doesn't appear to be another, better product on the market, so go with the Petmate!

Petmate Fresh Flow Water Bowl for the kittys
Reading some of these reviews I find there are quite a few people out there that don't know you have to take the little motor apart and clean the cat/kitty hair out of it to keep this unit working like a top and it's not that hard to do either. I have had my unit for about 3 years and my kitty's just love it. About once a month or every six or so weeks I unplug the unit and totally clean it out and the most important part is cleaning the cat hair out of the motor.. This really is a great product. Thanks Petmate