Pros
Most of the people are highly talented and friendly. The main office environment is great. Some client sites, not so much.
Cons
The talent is hindered by traditional consulting type-A personalities (hiding in hoodies or brogues) who swagger around saying lots of deep insightful words, but deliver little and spend lots of time playing at politics to protect their jobs. Try and challenge them and you'll find yourself with a P45. If they loose a client due to incompetence, you'll also find yourself looking elsewhere. This is less a factor of the recent Cognizant takeover (which has caused typical) disruption, but a problematic leadership sub-culture that has developed over recent years. I hope it gets addressed and protected from the arrogance-driven culture that is a feature of every large consulting firm.