Pros
If you're new on the job market, it's a good stamp on your CV, whatever crappy assignment you might get. You'll probably work with some very skilled technical people, and pick up some neat tricks.
Cons
Where do I begin .. No recognition, always looking for selling a hack, no long-term strategy, everything is focused on closing that deal tomorrow, selling a quick hack and then moving on to the next customer. Absolutely unproffessional customer care, extremely bad employee care, as in compensation, benefits, working hours, everything was a nightmare. I worked with a broken CRT screen for 6 months because they felt it was "good enough", I sat on a broken chair for even longer, until i broke it completely. Inferior tools, proud but incompetent middle and team management. They ran a change programme, "Good 2 Great" which in essence meant that they give you a list of things that they consider to be the way to "great" and if you disagree you get fired. Apart from this there was the "good to great" brainwashing, every week there was some g2g activity at which you had to appeare - otherwise someone might think that you're not interested, and you're the managements crosshairs Complete nightmare ..