If you need to get replacements under warranty, inspect them
very carefully for damage after they've been fitted before you leave the dealer. Just because they're new doesn't mean they'll be in perfect condition.
I had 2 warranty replacements fitted to my mk6 GTD last week and I inspected them with the service manager; both were damaged! Whether they were damaged before or during fitting, I don't know, but the marks on one of them certainly didn't look like it would have been caused by careless fitting.

They're ordering me 2 more and the service manager said they'd make sure they are perfect before I go to get fitted (again).
Given the choice between painted / powder coated alloys and diamond cut, I'd take painted / powder coated every time.