After owning an X5 4.4i, I finally "gave in" and got the new R350. But boy, I'm impressed. I really love this car, the room, the features, etc.
I'm surprised how well it handles for such a big car.
One concern though. I bought it two weeks ago and it has been in the shop already. The message center said that the a second row seat wasn't latched, while it was. Took it to my local MBZ dealer who said it was some computer issue and fixed it. The message hasn't appeared since.
I sure hope I won't be at my dealer with problems every other month, or so.