I remember hearing a lot about the 3-series' manual tranny being quite unreliable (read "dead at 90k"), but I haven't heard anything about the automatic.
In any case, GM should make a bit more noise about this, especially the Bentley and Rolls-Royce bit.
I can already see the tagline (hopefully better than mine): "If you could buy any transmission in the world, would you pick ours? Bentley and Rolls-Royce did."