I applied to host there. . . I didn't get the job, but the menu looks amazing. But mad expensive (but I guess it's par for the course for Rittenhouse Sq.). The Yelp reviews make it sound terrible, but I think a lot of the complaints stem from the kinks associated with being a really new restaurant.
If ya still need a job, everyone's favorite south philly vegan coffee shop might be (is) hiring...
But YES, EXPENSIVE. All of her restaurants are pricey for what you get, but I'm still excited to try BB, eventually.