When I got the email letting me know my last-minute assignment for the week would be to go pick up, drive, shoot and review the 2015 BMW X6 xDrive50i , I had to slap myself in the face for a second. Why, you ask? Well, even if you didn’t ask, I’ll tell you. I’ve never driven an X6. I’ve driven all sorts of BMWs, almost all of them, I think - excep