Evernote is a fantastic app. On top of being able to get rid of stickies, it's ability to be accessed on so many different devices makes it incredibly useful. This is helped by the simple fact that it is user friendly. Usability plus usefulness equals a great app.
Our students would really benefit from this and while they would hate how they were no longer able to lose their notes, it would ultimately be a great thing for them if we got universal usage out of Evernote.