Diva Cup?

It's finals week right now, and I just got my period. I'm looking for more comfortable ways to deal with my period so I don't have to change it that often without being unsanitary. I heard about the Diva Cup but I wasn't sure from some reviews I read if I should try it.
Does it cost a lot? How do you take it out and empty it? How sanitary is it? Can it really prevent leaks?
Thanks!