Update after a long day trip from PA to NJ yesterday...
After three years of driving at least monthly from the western suburbs of Philadelphia to norther NJ/NYC, I was able to make a day trip in my M3 without needing a charge. My rated range to start was 308, and the temp was in the 30s when I left and warmed up to the high 40s by end of day. I drove at 65mph almost the whole way, and made the round trip with 50 miles of range still left. What freedom! In my MS I would have needed to stop for 30-45 min of charging on the NJ turnpike.
Also, the more I have listened to the sound system in the M3 the more I think it's the best I have heard in my almost 40 years of driving. The clarity of the streaming from Slacker has something to do with it i'm sure, but the bass literally pumps vibrations through your left leg while driving and listening at higher volumes. Speaking of Slacker, I never explored it during my three years with the MS since I have Sirius in that car. I will most likely not renew Sirius in the M3 even when it's available. I can stream from my Sirius phone app when I need to listen to CNBC or other non music channels...no need to add a Sirius subscription for music.
On the "we are still driving a beta product" side, I have had a message since last week on the screen telling me to get my charge port door serviced, even though it seems to work fine. I called the Devon PA service center and they want me to come in and have the door replaced which I'm doing this week.