Just updated mine, took about 35 mins. All seems back to default setting, wallpapers saved before are gone. No problems on other settings such as Ambient Lighting and the usual modes.
With regards to the new features, Siri Eyes works well, it's just that her/his voice sounds like in a box/mono compared to the built-in voice prompt of MFT.
On the phone's ease of bluetooth reconnection, yes, it does connect to your phone faster and easier. I had this problem before the update wherein I seldom forget to turn on the bluetooth on my phone before starting the vehicle and turning on MFT. Even after turning the bluetooth on on my phone while MFT is running and on the first quadrant it says connecting to phone, it can't connect automatically unless you go to the connect phone menu, select the phone, and tap connect. Now it just automatically connects to your phone without going to that said menu. Overall, pleased with the update, although of course it could've been better if it is Sync 3 with its much better interface and operability. But hey, at least they didn't forget us MFT users.