I use iStudiez Pro; it's great for knowing what assignments are due, upcoming tests, what classes you have, etc. I highly recommend it (best app of it's kind that I've seen).
I have Things, 2Do, and OmniFocus. I just wanted a more school oriented app. I think I'll try it out mew and if I don't like it I'll just stick with my GTD's. By the way I am a freshman and I have a complexity of stuff so the app has to be really in depth. I wish they would change the name to just iStudies or Studies.