Well, BBS is a TOP German brand. Alessio is an Italian brand, that sells as much here in Europe as BBS. But, obviously, you Americans have many of your own brands that us Europeans have never heard of...
Alltogether, I would not trust most of the aftermarket manufacturers quality, unless the rims are tested by TUV or some other quality supervisors. The German car magazine
Auto Bild did a test on aftermarket wheels with TUV, and found serious quality and safety problems with many brands. That is why I think that hardly any aftermarket rim has good quality (or equal to OEM quality). Only the top brands that are ofter far more expensive than OEM rims, are of good quality.
Oh and the basic OEM BMW rims are manufactured by a German brand called Ronal. The M rims are made by BBS. Both brands are TUV tested quality. In other words, OEM quality.
Here's a link to Ronal. Incase you have never heard of it...
http://www.ronal.de/
(Ronal manufactures OEM rims for BMW, VW, M-B, Porsche, Opel, Ford, etc.)
I don't know if you have tighter quality control in the U.S. than in Europe, but here it seems that there are many manufacturers that sell all kinds of stuff they call rims. Other like TUV, call them safety hazards. I know that the EU (European union) it making a new tighter legislation, that would make quality checks mandatory in comsumer products, such as car components. But when will it happen, God only knows.