MCU2 upgrade is a waste of money. You won't get all of the features the newer cars have AND you lose FM radio. Just save your $1500 and buy an iPad. MCU2 is still slow and buggy, I wouldn't even pay $1k for it.
While I'm here, for all the P90D folks, how many actual miles are you getting on a full charge?
Totally agree. I had a loaner that was AP1 with MCU2 upgrade, and it validated that I don't need that upgrade. Yeah it was smoother and faster than MCU1, but I couldn't validate $1.5k to get a little smoother movement. I never cared about having netflix built in to my car, the interface on my ipad is much easier to use, and I can still use the car's audio through bluetooth anyway. As
@SO16 mentioned, my voice commands on MCU1 are basically useless, but again I don't use that much anyway so it's not a loss for me at this point.
With that said, if my current MCU failed or get the yellow ring, I'd buy the upgrade rather than spend similar money to just replace with another MCU1. It's just not really worth it to proactively replace, for me, in my specific use case.