I used them from 2005-2008 for my old M3. The last time they did a repair, the quality was shoddy. I had recommended them to my friend maybe 2 months earlier, and his bumper job also started peeling 4 months later. It's a shame, when I was first using them they were great. I can also walk to them from where I live, such a shame I can't trust them.
I used Mike's Autobody in Malden and was very impressed. It's only been a month or so so we'll see how the work holds up in 6 months.