My opinion is possibly changing. I am a manual fanatic; every BMW I haved owned (3 so far) has been a manual. I was not happy that at first there was no true manual option on the E60 M5 and then very happy when it was clear there would be.
Since then I have been reading the impressions of the owners. The torque down low is seemingly not as much as in the E39 M5 and the engine needs and wants to be revved high to enjoy the amazing power band. Plus, the 7-speed SMG transmission was designed for this engine. So...
I am not in a hurry and based on BMW's reputation for getting the bugs out and doing a minor facelift during year 3 of production, I will await the first 6-speeds to arrive before making a decision. But I must confess, I am amazed I am even considering the SMG!