I have the freshflow and love it, I've had it for almost two years now and I have never had a problem with it. It's also really quiet which I like. They do come in two different sizes, I have the smaller one for Corkscrew and Tibby and it's a perfect size. Once a day I refil the water tank and that's it. It even hold enough water that if I forget a day there is still plenty in there. It also makes a strange sound when it is starting to run low on water so you'll know you need to refil it.