I just purchased my 15" rMBP and am getting around pretty well, I'm customizing settings and adding apps and everything is going well. Since I will be going off to college in the fall, I would like to find a good note taking app that I can become familiar with before then. I will also be given either an iPad mini retina, or an iPad air from the college I am attending. I would like an app that will synchronize on the MacBook and iPad. So what do you guys suggest and what are some other cool features of other such apps?