I have been using mstyle since 2005 when I purchased my current E46, during this time they have done the following work.
Fitted CSL style alloys, M3 style mirrors, full M sport kit and Eisenmann exhaust. They also colour coded all the body moulding and painted rear diffuser. The standard of work has always been high, and if I have had any issue it has been rectified quickly and without fuss. I would recommend mstyle if anyone is considering using them.