I fitted the RE003s in 235/40/18 to my GTI just a few weeks ago (see What did you do to your Mk5 today?).
Replaced Conti Contact 5s on the stock 17" wheels.

Definitely a little more road noise on coarse chip surfaces, but actually might be smoother over small bumps - I think the sidewalls are quite compliant. Grip is great so far - but haven't pushed them too much yet. And no wet weather in Adelaide to test...