Timothy I appreciate that it has it's own problems to compensate for the lack of asymetry (sp?). As I understand it the major problem was unrecognised lack of power from the rear engine on takeoff. This was compensated for by powering up the rear engine first. I've been told that you rapidly realise if the rear engine goes down in flight due to the large reduction in noise (ANR headsets could disguise this though)! Still think they look lovely. Ah, if only I had the cash..........