They really aren't a big issue, IMO. Most of the people discussing this issue in this thread haven't had a transmission failure. Transmissions get lots of discussion on this and other boards, but that is about transmissions not meeting owner's expectations of lasting the vehicle life, not about warrantable failures or safety issues. If BMW dutifully fixes transmissions that fail during the warranty period, then what would the basis of a class action suit be?

It is usually a safety issue that prompts a recall.

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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