The typical "corporate America" work environment, with lots of layers in mgmt and lag times to get ideas implemented. - Anonymous employee American Express Employee Review
They have fantastic pay for the position you're in, and they teach you interesting and engaging utility of modern technology mixed with legacy fundamentals. I've learned quite a bit while AmEx while getting paid more than fairly - I'd recommend a stretch here to whomever may be reading this!
Cons
The Company is huge, and at times it may take more than a little time to get recognized for your abilities and the growth you've had. There's a reason there is a "only way up is out" reputation exists for some enterprise companies...