Pros
Benefits are great, the number of people there allow you to meet at least one person you will get along with, and the environment is quite lax. It is a stable place to work, and layoffs in IT have never happened, or at least that's what I hear. They take care of their employees with events, discounts, and an effort to get you involved with the community. They give additional access to fitness programs, jewelry sales, used car sales, and other items for sale at a discount. They are flexible with your work-life balance. The pay and benefits are better than expected.
Cons
This is a tough place for a younger mind to be in software development. The project we work on is a giant beast whose coding is grounded in some very old practices (Think GOTO statements), and there is little chance to improve anything. "Training" is offered when you start, but it is hardly enough to get you understanding how the code works; rather, it is a brief walkthrough of the website's UI. Documentation is next to nothing, there is no knowledge base, and asking for help is often like a pinball game, where you're bounced from cubicle to cubicle to ask someone else to get an answer. The project is Being an insurance company, there is red tape in every direction, which greatly slows down development. There are some hard headed developers who are adamant about policing other developers, and other developers who are adamant and vocal that their way is right and everything else is wrong. In the end, it can be a very discouraging place to be.