Pros
Vorsight has been around for a few years, but definitely has a start up feel. They are still figuring it out - which means that there is a lot of opportunity to give your input and help the company grow. I was at the company for only two years - during that time I saw new new strategies adopted, new positions created for strong members of the team and changes in the reporting structure. When something isn't working, it can be changed. The majority of hires are 1-3 years out of school. It is a very social environment. Especially for those who are moving to the city and don't know many people - you are sure to make a lot of friends!
Cons
With the pros, come cons. They are still figuring it out... some things don't work. As an employee, they are open to your ideas, but change doesn't happen over night, and you may be in a frustrating situation from time to time. Most often this is when you're put on a client that doesn't work out. If you stick with it and work hard, these things will pass in a month or two, but it can be hard to roll with it at times. Because everyone is young, there is quite a bit of gossiping and office drama - he said/she said. It is possible to stay out of it - but that is an effort you must consciously make.