Customer service is hard work, but the people around me made it easier.
Pros
The people I worked with and my supervisors where phenomenal. I couldn't have asked for coworkers or supervisors for my first job out of college. The company does a lot for their employees like potlucks, birthday celebrations, pizza parties, and an annual Christmas party. There's room for growth and movement within departments. If "Customer Service Rep" is on your resume, other future employers think "wow you did chromed service, you can do anything" (speaking from experience).
Cons
The job itself is extremely difficult. When I started, I joined the import group and took anywhere from 60-90 phone calls all day. Some calls are easy, but some people will yell at you for 10 minutes. It was a 9 hour day, 1 hour unpaid lunch, and two 15 minute breaks (in the AM and then PM). I couldn't stand being yelled at all day or listening to someone cry because they might lose their job if they don't have a container delivered. It's an extremely tough job.