I had the cambelt on the Superb done last week (CR140) as the car is five years old in November. It was done at my local VW specialist who look after both our cars.

Since it was done though I've noticed a slight whine when accelerating. It's only really noticeable when in traffic and constantly accelerating and braking etc.... Once up to speed you don't notice it. It's also probably more noticeable to me because it never did it before, that I can remember, rather than it being really loud etc.... With the car parked and the bonnet up and some revs on the engine the whine is a little more noticeable.

I called in at the place yesterday and they had a quick look and listen and said everything was looking ok and the noise was there but not what they would class as enough to be an issue and that they have done a few CRs and they have all had a slight whine after replacing the cambelt. They said the first couple they actually re-did the cambelt again only to get the same slight whine again each time. They also use VW parts etc.... As any dealer would so it's not that they have used cheap parts either.

They've advised me to keep an eye on it for another week or two and if it gets any worse to come straight back in but if it doesn't get any worse then it'll be fine. Now these guys usually really know their VAG stuff and have given me plenty of really really good advice in the past but I'm always concerned about cambelt issues and the damage that can be done.

it may be sharp "teeth" on the belt vs the very slight wear in the pulley's  as opposed to two bedded surfaces interacting   but will watch with interest to see how you get on