Pros
Owned by US Bank, Elavon is a conservative, stable company where you can work with friendly people. Like all companies, your experience of what it is like to work there will be different based on who your manager is and what area of the company you are working in. I am an application developer, and I can tell you that we have a very, very low turnover rate among the developers. Most of them tend to stay and we have many people who have been with the company for longer than 10 years.
Cons
Probably the worst thing that I know about Elavon is that the health insurance is very mediocre. Years ago, it was very good. Now, it is just passable. Most of the cons to working here that I had have been addressed over the years (this company is all about self-improvement), and I don't know many negatives that are not true of nearly all companies.