Just got mine done yesterday. Took them about 2.5hrs (quoted 30min to 2hrs) It's a whole i-step update so it wiped all my coding except VO coding. Bimmercode did not recognize the car as the same so it wouldn't load backups.
Also, if you have a 2014 model and don't have Siri Eyes-Free (long hold speech button to activate siri) or the volume pop-up— they are available to code now! Some icons are new. The trip computer is notably completely different now. Menu transitions are much faster too.
I can't tell a difference in driving yet.
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