Pros
I really like the people I get to work with, and (most of) the clients are very appreciative. Everyone's smart and generally keeps their cool, even when things change or a fire starts. I'm not sure where other reviewers are getting their information, but everyone I've worked with has been professional and has always put the needs of the clients first. Yes, this is small company, and the management team could do a much better job of facilitating orderly changes to technology and processes ... but this is also consulting and IT company, so I think there's always going to be an element of instability (unless you're working in someplace big and boring). The work itself ranges from occasionally tedious to brag at the bar to your friends how cool it is. It's also pretty nice that the work can be traced to actually helping science and people.
Cons
This place can get hectic. As I said, fires do start, sometimes big ones. When they do though, everyone keeps their calm and puts them out. Management talks about improvements on this front, but they've been slow coming. If they actually gave everyone the time they need to focus, we'd go from good to great, and a lot of the small issues would evaporate.