I have a friend who works on the sales team, and he loves it there. Says the energy and culture in the company is amazing (I specifically asked him about it a while ago, since it was when there was a lot of talent moving back and forth between Facebook and Google)

Looking at their hiring practices, it appears they are trying to get serious hackers there. Unfortunately I haven't heard great things about the engineering team from other folks, but none directly from an engineer, so treat that as Valleywag level gossip.