I owned both, a North American and a Euro, E12.

I liked them, but definitely preferred the Euro car. It was a 528i chassis, but was set up like an original E12 M535i. 3.5l engine, that was cammed and ported by Schnitzer in Germany before the car was shipped stateside, close ratio dog leg 5spd., LSD, Alpina steering wheel and shift knob, Recaro front seats, and three piece BBS 16" wheels. That car was a ton of fun to drive, but needed restoration badly. I eventually had to sell it to help finance going back to school.