Amazing performance, synergy with driver, quality, features, completeness of design. The very definition of excitement, excellence, and elegance. A whole level beyond most anything else. Supercar capability combines with everyday utility. Why did I wait so long to go Bimmer?
Superb quality of overall driving experience. In-depth quality, both in design and in execution, that shines through more the longer you have it. So many little things are exactly right- -very satisfying.
Rear seat room, trunk room (understand both are better in current model). Cupholders, of course. Little else.