I like them,have similar issues to an e60 after all they pretty much are an e60 coupe, they are a 4 seater, the rear seats are abit of a joke, are either of the kids under 9 months? As a rear facing seat will be a real issue unless you have an axiss or the likes that twists. Ive driven a few and really liked them, dont undersand why your ruling out the 635d though? There a fantastic car, the 630i to me feels a little under powered