Flexible hours, useful career training in many cases
Cons
Pay is decent but not great, and graduate work-study may be getting cut in favor of undergrad work-study based on changes in federal regulations, but how/when this will happen is unclear.
More laid back environment than corporate. Make sure if you want to work with students you carefully ask questions in the interview. I wish I was working with students more - instead I'm doing administrative busy work most of the time.