Pros
I worked at Alliance Data for over 8 years. I started in the call center in college and moved to the Retail HQ where I worked for a few years. The company has a ton of great people and they have a great road map for the future of the organization. The culture as a whole is top notch and a vast majority of the associates are good at their jobs and an absolute pleasure to work with. They invest in their employees and as a whole want to see them do well.
Cons
The biggest negative I encountered at Alliance was that quality of work often took a backseat. They catered to and promoted those people who were always happy and upbeat, even when they weren't typically very good at their jobs. Meanwhile, those who preferred to come in and focus on doing good quality work were frequently held back from moving up in the organization. I had the misfortune of working for a manager who was particularly incompetent and frequently passed the buck down to those underneath him. More than once I was prevented for applying for positions internally that fit my skill set and experience simply because my manager did not want me to.