Pros
A good brand name. External employers think of it as a bastion of excellence.
Cons
It's a bureaucratic nightmare. People are over promoted. Far too many people at GCB4 and too many people at GCB3 who should be demoted and told to actually do some work. There is no downside to not doing a good job. This company tolerates underperformance. The turnover of good people is horrific. If they actually developed their top talent, they wouldn't be left with a bank that is riddled with people that have been there for 15 years plus and think they know EXACTLY how the place should work. They lack perspective. Know this - the only thing management give a monkeys about is progressing their career. Don't tell HR anything you wouldn't tell the CEO to his face. They are his henchmen.