Ok, I used them middle of last year for a previously owned TT with the 19 RS wheels.
It took them 2 attempts (and 3 on one wheel) to get a perfect finish (specs of dust in places under the paint).
In the end they were ok, but the issue is they dont have a clean room (the place is a tip).
A mate just had a Cayenne wheel done and it had a couple of specs under the paint.
As I said to him, if you werent bothered about a perfect finish then you'd just get a cheap onsite job done.
Personally I would stay with Lepsons or a large outfit with clean facilities.