Pros
Good pay and benefits (I have yet to come across a better paid time off policy). Gartner is the unrivaled leader in the field, so you feel a sense of pride in the company you work for. You are able to witness Gartner insight solving client problems, saving clients millions via contract reviews, etc. so your feel a sense of purpose in your job. The level of intellect you are surrounded by is impressive (particularly in any role that involves interaction with the analysts), and most of the employees are good, kind people.
Cons
Talent management and career pathing at Gartner is virtually nonexistent. Moving within the company is not discouraged and happens pretty regularly, but good luck getting any help figuring out where you can move or what you need to do to get there. You're on your own. You really need to take initiative and make sure you don't get complacent in your current position. No one has a problem with you staying in the same position for 15 years without making any forward progress, and there are quite a few people in every department that have done exactly that. Client Services is oftentimes treated as "second class" by other Gartner business units. Some of the analysts look down on us as well-paid secretaries, our primary purpose to them is to fix any of their scheduling mishaps. Sales is probably the worse offender, however, often treating us like idiots or taking out their frustration on us because we stand in between them and the analysts. It's a good thing we do serve as this 'gateway' to the analysts because many sales reps have a limited understanding of the technology involved in their client's/prospect's issues. Without being able to leverage us as knowledge specialists, they would be left to struggle on their own and lose face with clients. The metrics used within the department to track employee productivity are rudimentary and put more emphasis on quantity over quality. The focus should be based on interaction quality and content knowledge rather than quantity/volume metrics that are used in call centers.