I like the Lab 9's (and looking back at some of the more "classic" designs; I'm pretty happy with the direction B&O / D. Lewis has taken of late). The designs are fresh and organic. B&O has always stayed away from the ugly black boxes (save for the Beomedia and the DVD1, and a few others), but the Lab9's seem to have a personality of their own, as do all the speakers with an acoustic lens.
Let the metaphors begin: The Lab3's are the little bulldogs, cute and stout, but step back as they can pack a punch. The Lab 9's are like monks, wise and unobtrusive, but since their sound is so superior to anything else, you have to listen. The Lab5's are the emperors of the soundstage. They not only look imposing, they also back it up by bringing beauty and clarity, and sonic vigor when necessary. The 7-4 serves it's purpose well, like the functional workhorse it is. It does what it says and says what it does.
The only acoustic lens speaker I have somewhat of a dislike for (design wise) is the Beolab 10. It seems too gimmicky. Maybe that's because I never liked the design for the AV9000.
-Sal