Pros
FactSet is a great place to start you career because: the salary is very competitive, your colleagues are all nice, you are given much responsability and the you get to travel either for internal or external meetings. The senior management has a clear view of what the corporate strategy is. FactSet is a growing company which has been rewarding its staff very well over the past few years. You will have to work hard if you want to get advancement but I think this is only fair. You will get a lot of recognition for your work. You management will be thankful for your work and you will get salary increases based on your annual performance.
Cons
The only downside in my view is that clients can sometimes treat really bad because they need things things straight away. This often happens on the IB side. Appart from this, everything satisfies me.