Avantages
Some of the people that you meet and work with are great at their jobs. The benefits package available is very good, allowing you to pick and choose what take.
Inconvénients
Don't get too comfortable - on average you will move desk/office 3 times a year Departments change (merge/de-merge/etc) at the whim of management. On more than one occasion teams have been split only to reform months later when management realize why it existed in the first place. Cost cutting to produce cost savings are ridiculous (obtaining a pen or pad requires a managers authorization). Management are very reluctant to share information with employees - in recent times an article in the FT appeared before employees were aware that there were merger talks happening