First of all I like corrosion resistance BMW has. It's one of the best. I've never had rust issues with any BMW I've owned (can't say same with Dodge, Ford and even Honda and Nissan I've owned in the past).
Secondly, ZF8 transmission is very very good - I like almost everything about it, tho maybe it's not entirely BMWs fault
Thirdly, I like the looks! Got complemented twice within last 3 days
I sometimes just stare at the rear of my x5 and think about how perfect taste I have in cars