i own one, They are very quiet and sturdily built. Useful features like removeable intake/outtake unit ( the uk version also has taps not sure if that's the case on the US marketed ones though) and handle. I'm very happy with mine, over here in the UK they are priced very competively and imo they are the best value cannister filter on the market. The supplied media is a little average though, some coarse sponges, bio balls, carbon, some c. rings, and a piece of filter floss.
Basically i think they are a bargain. Unless i need a really large cannister like a eheim pro3 size or special features like electronic controls or heating element incorporated. I'd get one of these filters, perfect for more average size tanks. I have one running in my bedroom 125L tank.