The Drinkwell Pet Fountain is the first one that came out (hence "the
original" in their ads), and I have 3 of these.  Got one at first, set it up
in the kitchen and cats were afraid of it!!!!  So we unplugged & emptied it
(all the while cursing the finicky cats), and set it in a high
traffic/central area of the house (an area the cats *have* to travel through
to get from one area of the house to another but had plenty of room that
cats could avoid the fountain until they felt that it was 'safe' to
approach), and let the cats get used to the presence of it first.  Slowly (a
couple of feet a day) I moved it closer to their drinking bowl, and then I
let it set there a couple of days.  Then I filled it with water while *not*
filling their other dish with water.  Now they were drinking out of the
fountain without it on.  Finally, I plugged it in.  At the time, I only had
3 cats (1 @ 11yo, 1 @ 10yo, and 1@ 2yo), and they still drank from it.  Then
I found an abandoned kitten, just a day or so old, in our yard.  As he grew
up, the only water he'd ever had has been from a Drinkwell.  In April, I
found 4 more kittens and adopted one of them out in August, but still have
the other three, and they all grew up with the fountains.  Some of my 7 like
to drink from the stream, some from the bowl, but some will drink from
either.

I disassemble them once a week for cleaning (they're made to come apart, you
can even remove the impeller from the pump, and the pump from the main dish
housing), wash the filter, and once every six weeks I replace the filters
with new.

... but yet some of the cats still like the water from the tub faucet.  Go
figure.

We have Petmate Fresh Flow. No complaints at all -- especially from the
cats! I do believe they drink more water because of it.

We originally got it for an 18 year old kitty, but the younger cats
loved it as well.

Rhonda

I'd be wary of anything plastic - cats hate drinking from a plastic
vessel, at least mine have.

I've used both of them and like the drinkwell the best.  Your cats will see the
water coming out and with it being cleaned by the filter they will most likely
drink more, that is what my cat did.

Kathy