Ooohhh, my mate had his M135i xDrive delivered a couple of weeks ago. He took me for an entertaining ride. Of course, driving the cars I do (520d with reduced power
or e39 with 5 step AT), it's easy to be enthousiastic about such a focussed and sharp instrument!
He just had the car for a few hours and was not giving it a lot of poke. But in the first roundabout he accelerated with authority in a manner of which I can savely say that my 520d would engage in an oversteer/overpower drift, the xDrive stayed rock solid and remained totally neutral.
I'll see him next weekend, I'am curious for his experiences after a few weeks. But I'am already pretty certain he has fallen madly in love with his new toy by now, and I'am expecting that the xDrive is adding to his desire to drive it over and over again while inviting to drive even more dynamic than he would in the RWD.
He, maybe he'll let me grab the wheel by now!?