not the best experience ever.
Pros: AML is a highly desireable field to get started in
Cons: you're made to feel like just a production number
the campus itself is really nice and the cafeteria is wonderful. there's a lot of cultural diversity but not much age diversity (walking down the halls feels almost more like a college campus than a corporate campus). everything about citi is on a very tight purse-string, so maybe there's some hidden agenda about not hiring older people (for instance, less chance of a workman's comp claim, etc)
overall, i've had a pretty rough experience at citi. i work in AML name screening, and the atmosphere is such that you really feel that management doesn't care about morale on the floor whatsoever.
AML is highly marketable, so maybe it's worth going into in the long run, but be forewarned... it has not been the best experience in comparison to working for other banks.