Once I was inside, I found a few teams that sounded cool. At that point, I could easily meet people on those teams, read survey results on the managers, ask around about the new teams, visit the offices at 6-7 PM and see who was still around. This is somewhere between 10-100x the information I could get as an internal employee than as an external applicant. This led me to joining a team where I'm very happy. And if things went really badly -- I could have switched again! (Might look bad if you switch a ton though)