I have a 2.0TS GTV, 22k miles and full Alfa Serviced.
BUT, there is a noise when the clutch is depressed which sounds like a buzzing and gets louder and quieter as you rev the engine. It doesn't matter whether you're stopped or moving the noise is the same!
It has no apparent effect on the clutch take-up, gearbox selection or engine which all seem fine. Occassionally the noise dissapears!! But it comes back again!
The Alfa dealer thinks it might be a clutch release bearing but he's not sure and this is a fairly big job simply to check, (clutch & box out, etc) so I've not gone for that option yet.