Pros
The managers are really understanding about you needing time off for exams and school. Also, the people you work with are very friendly and nice. Customers are on the whole respectful and friendly also. You can hold multiple positions in a short amount of time. I was promoted to Bookkeeper for Friday nights after about 2-3 months of being a courtesy clerk. You learn things like bookkeeping, balancing tills, floral arrangements, flower care, etc.
Cons
Even though I was "promoted", because I was a courtesy clerk, my pay didn't raise--still made a courtesy clerk's salary while doing other tasks. As a courtesy clerk, doing carts were terrible because you had to do it for an hour at a time. Also, the store manager then seemed very detached and uninvolved. Lastly, the hours were pretty bad for a college student...I would have a lot of 6-midnight shifts and holidays required a lot of running around and overtime.