Got it home tonight and got it all hooked up - I can't beleive how little noise it makes (hardly noticeable at all - air pump makes more noise than the FX5 does!).
Just about fits in my cabinet too which is good. Loads of crap came out the pipes when I started it up, but its clearing REALLY fast, so its doing its job - I have the U4 turned off too at the moment, so its all being done by the FX5. Very pleased with the purchase, esp considering it has the UV on it and is full of media - I soaked it all in tap water to kill off the bacteria from the reef tank it was on and gave the baskets and inside of the canister a good scrub, so I am hoping it will all be ok.