Pros
Good office atmosphere between co-workers. It varies between offices, but overall the company does a decent job at hiring good people. Fluctuates from fast to slow-paced throughout the week, so it's never monotonous. The company allows for a flexible schedule, which is perfect for students.
Cons
Clients can come in or call already upset (usually because of the IRS) and blame H&R Block for their problems. As a CSC it is your duty to be the front representation of the company, so you take the brunt of client complaints. As the face of the company, it is important to never look bored or like you have nothing to do, which can be difficult when the day becomes slow. In my experience my manager would get upset with me for having nothing to do, even after restocking the entire office.