Interesting the concern over GM transmissions being in the X5 3.0 (and lots of other BMWs).

As I understand it, the GM 5 speed has BMW controls in it. Most of the transmission issues that I have read about over the past years have more to do with control programs, electronics, etc, than with the mechanics of the transmission itself. I would be more worried about the BMW content than the GM content. Same likely applies to the ZF transmissions in the 4.4/4.6/4.8, as they will have BMW electronics and ZF mechanicals.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue