I really like the i3, however, I too have concerns over a couple of minor details:
Range extender is a must for me as my daily commute is 35 miles each direction with frequent side trips on the way back home.
Also, the interior is very futuristic, but the seat base reminds me of a 70's wagon bench seat. There needs to be some design implemented to allow some bolsters in order to make a more comfortable seating position.
Just my opinion, but younever really know, I may be convinced to be an early adopter on a short term lease.