I cant tell if this is making my cat drink more, but since installing it she has preferred drinking from here rather than her water bowl.
It does make a little humming noise that can be annoying if you are sitting very close to it and get annoyed easily, but its not really noisy
I've had 4 different drinking fountains over the last 4 years (tried new ones regular due to not liking the 'fussyness' of taking apart, washing & resembling) the catit fountain is so easy to maintain compared to the other more expensive fountains I've tried so very pleased I gave this one a go (more importantly, I think it is my fur babies favourite fountain too) & of course the filters are an important part of the fountain so I highly recommend these too :)
My ragdolls love their fountain and it's important to change the filters regularly.
I buy mine from zooplus due to their great customer service , value for money and super fast delivery.
I highly recommend getting your cats a fountain and using zooplus.