Pros
Work in an international environment with people from all over the world. You'll meet truly exceptional people and will be surrounded by intelligent individuals, who will broaden your horizon.
Cons
Gartner ESMB is the brooding ground for political games and shows a constant power struggle between (new) managers and their old peers. Senior management runs the unit by instilling fear of being fired rather than through driving and motivating individuals. Contrary to what is promised, those who are successful, are given limited career options for further development, i.e. even with the world of Gartner at your feet, only promotions within ESMB will be approved. Senior account executives who can't fully commit their time due personal reasons (e.g. (long term) illness or pregnancy), are treated as worthless and will see their territory/client portfolio be distributed among their team and taken away from them without consent. As HR and senior management go back a long way, making a case about all of the above is proven to be tough and not without consequences. ESMB hasn't changed for the best in the past years and needs to evolve back into the proud, successful unit it once used to be.