Let me just say all of this is new to me with my BMW and these vendors.
In the Subaru world, this kinda $hit simply wouldn't fly. Sure there were group buys, but they were dead on with their delivery dates. I too notice a lack of general professionalism with some of the vendors for BMW aftermarket parts. And again, with the tough competition there is selling Subaru parts - they'd go out of business overnight pulling this crap.
That said, I also have bought some BMW parts from some excellent vendors on here... BMS, AA, N54Tuning, PSI to name a few...
2010 135i | 6MT | Le Mans | Prem Pkg | M Pkg | CA | Hi-Fi | Boston | Other Cool Stuff