I'm growing to hate the suicide doors on our i3 and I really hope the model 3 doesn't have them (the i3 is leased and the plan is to return it to the BMW dealer close to when we get our model 3). We have a one year old that rides in a rear facing car seat and the suicide doors on our i3 present two problems. First, you have to open the front door prior to opening the rear door on the same side and in tight parking spots you kind of get trapped between the two open doors and the adjacent cars when loading and unloading the kid. It's not impossible, but you have to do lots of things in the right order for things to work. If the rear door could open independently of the front door this would fix this problem, but dealing with rear facing car seats would still be a pain and presents the second problem we've encountered.. We have with a small rear facing car seat that detaches from a base, but we looked into getting a larger convertible car seat that can be either rear facing or front facing and while it would physically fit into the i3 in the rear facing configuration, it was nearly impossible to put the kid in there or take him out when the car seat was installed because of the geometry of the rear door. So we're going to be pretty limited in our choice of car seats until our son is old enough for a front facing seat.