Pros
Limitless possibilities for career change, however, you have to wait 1 year before applying for an internal job. Great benefits and good culture. The company is very conservative and deliberate with their compliance and paperwork... that is both a positive and a negative in my opinion... sometimes that makes it harder for you to do what you were hired to do... "red tape"... however, that same conservatism and deliberation is what probably is helping JPMorgan become who they are today.
Cons
As with many large employers, who you know sometimes becomes more important than what you know. Also, depending on your line of work, job can get very monotonous. I quite literally left the company because I was bored and felt I needed a different challenge. I have noticed that "hierarchy" plays a major role in everything the firm does... I saw many poorly qualified people (specially in my area "retail sales) dealing directly w/ the public; yet, the company seems to somehow turn a blind eye to that as long as the numbers are being achieved. It was a sad realization, but a true one. The company will not train you to be better at your job... that is entirely left up to you and your direct manager. I was lucky enough to have a fantastic Investment Manager... however, he was truly "one in a million" there... Technology at JPM is "ADEQUATE" AT BEST! Very much below where one would expect such a high profile company to be.