The 750 is a very much improved vehicle as compared to the 2002 745Li I owned. The performance and handling is superior and the car just feels better built. I was surprised at the difference in the two models. Feels more like the old 740iL.
Performance and handling. Once I've gotten use to the styling, I actually like it better than the previous models.
Same as everyone else -- get rid of the tiny shifter and put in a stick like the 740's. The I command is improved and once you learn how these cars function, isn't all that bad. It will take a lot of time to learn, though.