Noisy. I've had one before and I hated the thing.
I use an Akasa "King Copper" - £15 here in the UK, keeps my 3000+ (stock) at 43C idle, 52C load.
You might also want to look at the Speeze range, I think the Athlon one is called the Falcon Rock II. They're even quieter, but the cooling performance is slightly worse.
Also, you could mate the fans to a fan controller, such as the Aerogate II (Cooler Master), I have the King Copper turned down to 2000rpm and it's lovely and quiet
