Pros
The reputation and the money. Looks very good on a resume. I felt the compensation was higher than other firms were offering to their back office support staff at the time that I worked there. The benefits package was extremely sufficient and you were also given access to GS's PWM platform and had access to all GS Research for HNW's and Institutional Clients.
Cons
If you are in a back office position (i.e. OTFS) it is very difficult to transition to a front office capacity (i.e. IB, IM, S&T). I am sure it is obvious that I wanted to transfer and was not able, but I am not posting a negative review because I am bitter, I am simply doing this so that other who have the idea that they can get into GS through a "back door" and transfer to a front office job are not diluted. I had many friends who attempted us GS's internal job posting to get a position and all were rebuffed.