Pros
The company seems to take reasonably good care of you, with a good compensation package and benefits, and a bright lively working environment. There is a lot of expertise around to learn from if your objective is to develop an understanding of financial markets. The work is fast paced and you will seldom find yourself bogged down in your job. The ability to handle pressure, look at problems from a business perspective is valued. Good kitchens.
Cons
Code base is old and can be frustrating at times. Core technical people, who want to develop their technical skill set will be put off by the demand to get the solution out to customers, often sacrificing quality. If you're in a team that works on legacy products rather than new ones, the skills you pick up will be in proprietary techs that are not transferable. The flat hierarchy, (3 levels from new fresh-from-college hire to the head of R&D) may not leave room for advancement that you can show on your resume.