Depending on the group you work in, you may never get promoted. You may get a "promotion" in title, but to get promoted to higher levels of responsibility you may have to look at another team, city or firm. Some managers can be very hands-on, always looking over your shoulder. The more recent hires tend to be very smart, hard working teammates (that is a pro, obviously), but brokers who have been around for a long time can get complacent with their client base and the work they do. Aon provides their clients the best service and solutions possible, so the very hard workers have to pick up the slack of those who do not work as hard. Some of the underwriters with whom you do business have their own internal issues that affect your job as a broker (though, a broker at any firm would have this experience if they are working with those underwriters, so it is a con for the type of work, not Aon only). Some of the administrative staff leave much to be desired. Bonus calculations can be frustrating (as far as I know, you never receive the target amount agreed to in your employment terms/job offer letter).