For example, one thing that I really appreciated was the non-combatant atmosphere unlike in many places in the corporate world. It really is ok to run your idea by all kinds of people, talk to anyone you meet regardless of their position, and generally feel like a peer.
They have a ton of bright folks, too.
Also, you get one day a week which you can spend working on 'your own' project, whatever it may be. The schedules are flexible aside from team meetings, and people are quite relaxed.
So yeah, it's a good spot to work. Kudos for preserving the grad school-like feeling...