Pros
If you get onto the right project it is a fantastic place to learn, paid education if you will. If your even luckier again and get into one of the clique teams then your socializing habits and alcohol tolerance will go through the roof! Salary is good to start off with if you come in at a good rate but don't expect it to change...ever. Management reward talent with promotions, the only problem is that talent means somebody 'in the clique'. Nepotism is rife in some offices. You'll get to do a bit of travel along the way if you like that sort of thing.
Cons
Management are 10 years behind the curve. Senior development, architecture and hr managers are in bed with each other...literally. If you don't comply to their archaic methods your a lost soul. General atmosphere in most offices is that of dissatisfaction. Any good people leave and are replaced by juniors/grads/contractors who in turn leave when they figure the place out and the cycle continues. Alcohol abuse is rife in one office in particular.