Pros
Advent makes the leading investment management and performance reporting software. If you work for them in any capacity and later chose to work in other areas of finance your resume will get noticed. I knew very little about finance and technology when I started at Advent in an entry level position, when I left 4 years later I was fully prepared to meet the needs of various private wealth mangers and other financial advisers. I could not think of a better choice to start my career, now even years later having worked at Advent always gets me a call back from hiring mangers and has allowed me to get some great jobs.
Cons
I was not able to advance as fast as I wanted at Advent and felt stuck in the technical support role for longer than I wanted, however temper this by the pros mentioned above as working in this role provided the foundation for great success after working at Advent.