They had one at the Baltimore GP and I shamelessly climbed inside and poked around it. I'll withhold judgement on the interior because this (preproduction?) example had horrible fit &finish, but it might get better once they start cranking them out.
It looked sensational from certain angles and clumsy from others. It's huge of course and has amazing road presence. Not that I could afford one, but I really hope to drive one someday.
2009 E90 M3 ED
2014 X1 28i ED