Pros
Their clients are large companies who outsource their customer service. They promote almost entirely from within, so there's a good chance that your boss and your boss's boss started on the phones. The quality of the experience can vary widely upon which program you're hired into. My program was pleasant and the workers were good people. If you don't have high level of education or if you do and are looking for something to make ends meet between other opportunities, this is an acceptable place to work.
Cons
Like many employers, advancement can be influenced by connections to the right people rather than talent. A large number of the employees are apathetic or incompetent. In my program, the rate of pay was very low for the level of work they expect you to perform.