Pros
SAIC i s good company to start your career with, however i have noticed that if you stay with the company long enough you will get the management roles, as majority of the senior management in the company has been with SAIC for 10+ years. During interview i was told that if you stay with the company for first 4-5 years than most probably you are not going to leave. However if you are joining SAIC as a experineced, than make sure you are getting a good postion with good pay, because i have seen that there is a quite a bit difference in pay for people performing same job with same experince level.
Cons
I have not seen any downside with working at SAIC, however it feels to me that it is ok if you are working at the manager level, however just a regular employee you are not treated as well, and not paid as much.