Pros
If you are in financial services, JPMorgan is the place to be. The executive leadership is phenomenal, and the bank well positioned to come out of the current crisis in great shape. From a technology perspective, a lot of time and effort is spent running it as a business, but also focusing on being a fast follower of leading edge capabilities. Huge budgets, and the ability to do things that would be far too expensive elsewhere.
Cons
In the current environment, there is a sort of stigma being associated with a bank - especially one that is now partly owned and "managed" by Washington. However, JPM has good things going for it. Not enough real innovation and a lot of waste in duplicative systems and processes - part of the downside of being sugh a huge organization.