Pros
OK pay packet and benefits Amex employ top professionals, so you will work in a very professional environment You may run into a few amazing leaders Amex is quite brave and innovative compared to other industry players Big in US, not so much outside You will learn ins and outs of management by objectives and boring things like budgeting, performance management, etc. It may prove useful Good experience for a couple of years, then leave
Cons
Typical financial services company, very shareholder profit oriented No life work balance, you will feel squeezed like a lemon after couple of years Perfect for traditionalists and those avoiding risk, but lay offs are frequent, so beware Proper matrix organisation, very hierarchical, those who play politics get promoted