Pros
The cafeteria snack bar is lovely, and you can get your meals deducted right out of your earnings! With the gym, post office, dry cleaners and health clinic, its like you can just stay in their campus and have no reason to leave. The security team is friendly and great at their jobs, as well as the maintenance crew.
Cons
The corporate culture is one that discourages innovation - and the creative/development team goes out of their way to come up with reasons not to do work. The platform used is very out of date - and does not allow all but the simplest of front end development. Anything using current technologies (node, html5 - css3, backbone, js templating or even jquery) is highly discouraged if even possible. In my department there was no talking to coworkers allowed - and all internet access is blocked, so if you need external research (forums, stack overflow, etc) to code, you have to go against company policy and use your personal hotspot. My boss would call at 3 or 4 am regularly because of a photoshop emergency or needing a JS mockup ready for a 7am presentation. Everything is urgent, and other people's emergencies are your emergencies too. Plan on backstabbing, infighting and devisiveness. People work hard trying not to work. Great West's general work atmosphere is the exact opposite of collaborativeness. Keep your guard up.