Good summary. Also, the “S” versions have a bigger battery. These were very advanced, basically a test bed for EV tech for BMW and they sold every one at a loss. The chassis is molded carbon fiber, unfortunately, if that gets damaged in an accident, it can’t be repaired.
I am a BMW tech, and always wanted one. Unfortunately they are only RWD, and thus would be far from ideal in my area that sees heavy snow/ice.