i hadn't heard of AT Kearney until this thread, although to be fair, i'm not exactly well versed on the industry as a whole. However, I sat in on a company presentation and met with a lot of their consultants during a recent conference, and I was pretty blown away. Their guys seemed sharp and on point, especially when compared against guys from other household names.
Two things they spoke about that were pretty cool were 1) a global initiative within the firm, where you can actively get placed in overseas projects if you request it, and 2) the flexibility of the firm that allowed you to take short sabbaticals even as an associate. They mentioned stuff like paternity leave, but if you have a good reason, you can take a few weeks off for just about anything; one guy even mentioned taking a few weeks off to head to the Midwest to work on a nonprofit that hes a part of.
The culture seemed pretty laid back and flexible, and if you're not hell bent on M/B/B or bust, then I'd seriously take a look at these guys. I'm not 100% sold on consulting, but I think I will definitely keep in touch with them during recruiting season.