Pros
Customer service opens the door to move up into most areas of the company, which most people seem to do. The attrition rate seems pretty low. The call center is casual (jeans are ok), the scheduling is flexible (it's open 24/7 so plenty of shifts to work with your lifestyle), the training is thorough so you're well prepared for your job, and people are pretty friendly. The company itself is very employee-focused, with exercise programs, an onsite gym, frequent potlucks and contests, etc. But maybe most impressive is the level of attention you receive from management, right down to tiny details--like being given your own hand sanitizer and tissues to keep at your desk.
Cons
The customer service position is actually a call center, so be prepared for that (although, you're working with business-to-business calls and not so much with the angry public). The scheduling is very tight, so if you're 5 minutes late all the calls will stack up and it's a pretty big offense. The training is intense, so if you're uncomfortable having to navigate several systems on both Windows and DOS based programs, you might not be happy about it.