My cat wasn't too sure about this at first.  He's older and takes a minute to warm up to new things. It took him a couple of days to decide he'd try it and he really liked it.  He drinks from it all the time now. This is very easy to use,  quiet,  and much healthier for him to use than the water sitting in the bowl. I think my dog is jealous because he's way too big to drink out of this.