Stressful as heck!
My role as a collections agent for credit card debt was stressful. It was very competitive to get bonuses. However, I'm not good at this job, so I never got a bonus (I understand). The managers are pushy, as our numbers reflect their competence.
I hated the job itself, but the management was very kind.
Set schedule, stable hours, overtime available
Freezing office, very competitive amongst co-workers, and extremely stressful, as those who don't meet their quota get fired quickly.