I had Avus do a PPI on an older BMW (E28 535iS) I was thinking of purchasing; results showed the car needed a LOT of work that would have cost me many thou$ands beyond the price of the car, so I feel it was money well spent. These guys have a reputation for knowing their way around BMWs and are very thorough; they found issues with the car that I don't think most repair facilities would have noticed. Avus is probably more expensive than most, but I think it truly IS a "high-end" BMW shop and well suited to BMW owners who want some of the most skilled, highly-trained techs working on their car.