I think in your case Robin it's all going to be about execution. Get it right and it'll look good, get it wrong and it'll look a bit chavvy. The fact you are fitting them to what is essentially a pretty new and expensive car keeps you further away from it being Chav than me slapping them on my £500 MKII.
I say go for it, it's your car etc and if the worst comes to the worst make sure they're aeasy to remove.
Nick
....Hi Nick,
I agree - It's going to be all about execution if I do it at all. The TTshop are giving me some help and my bodyshop is an award winning accident repair centre who have already done excellent work for me and they're affiliated to my VW dealer. I won't start it unless I'm 100% confident.
You're also right about the age of a car being a factor. Hella have some lozenge shaped DRL's that you'd get away with on a Mk2 in the bumper probably but I'm not suggesting you would want to do it.
If the LED strips won't 'work' on my car, I'll look into some Hella round DRL's to replace my standard fogs - We'd have to adapt behind the honeycombe to fit, but again, my bodyshop is more than capable. I'm principally into DRL's for safety reasons but if they look cool as well, I don't mind being a cool dude!

Here's a pic of a conversion from a standard Golf to a GTI which some nutter asked my bodyshop to do:

Cheers
P.S.- It's the bright blue one!