Pros
Diverse work. If you have the right skills and the right management over you, you can get the space to go out and do some pioneering, to figure out what the firm needs and go deliver it. Great quote from former president Bob Scott: If you can't respect your manager, don't stick it out but find yourself a better place to work. Not everyone is that open and level headed but generally there are quite a few real people in the firm.
Cons
It's less fun if you get stuck with a micro-manager or arrogant know-nothing over you. In TK, work-life balance... with MUFG coming in things are bound to get more stuffy and rigid Japanese style. Bad quote from former president Zoe Cruz: Really, our business model is much better than a decade ago, because we can lay off most of our risk in the market and so increase leverage and profits (...just a couple of years before the global credit crunch almost killed the over-leveraged firm).