Did the clean up job on my 2007 C30 at the weekend and replaced the standard halogen H7 bulbs with Osram Nightbreakers whilst I was at it.
Whilst the flaking of the silver paint was minimal, the projector lenses were really quite filthy inside.
Anyway, with the lenses clean and the new bulbs there was a big improvement over what they were like before. Okay, I'm sure a full Xenon upgrade would still be in a different league, but this is about as good as you can expect with standard halogens.
Took me no longer than 25 minutes to clean up and fit the new bulbs so well worth it and dead easy.
J