It's the perfect size and an awesome little teardrop / yin-yang design. It took the cats a little to get used to it because the motor makes a bit of noise, but now they all love it - and are not begging to have the kitchen or bath sink turned on all the time! When the water level gets a little low (not really that low), it starts making more noise. Just fill it just about over-the-full-line - and the noise goes away! ONE TIP: I put water in it the first time and let it run - and they wouldn't drink it. I dumped that water and rinsed it out, then refilled it - and they were all over it. I think the dust or particles from the original circulation into the filter caused the water to taste funny to them. One quick rinse and new water did the trick!