Pros
This firm really respects the individual. Management is by exception, instead of hampering all employees with a bunch of policies to address the misbehavior of an occasional individual. Very refreshing and unusual in today's world, especially for a firm of this size. You really are in charge of your career here at Serco. If I just want to keep my client happy and enjoy my family, that is acceptable to Serco. If I want to put my extra time and energy into attending Webinars and creating a community of practice for Serco, they are pleased to let me do that.
Cons
If you are used to being micro managed, you might not like Serco. Also, because Serco does not force lots of "Serco requirements" on its consultants, you can become embedded with your client and "go native". You need to make an effort to stay connected to Serco because they will not intentionally pull you away from your client for little required Serco "drink the Koolaid" parties.