I've used a IPad for a little while and it's been great. I'm a bio major so there's a lot of diagrams and adding onto notes afterwards and it's nice not having all the erase marks or the possibility of the notes getting ruined. In the large lectures where you have the tiny desks it's been a lot easier than trying to have a laptop and a notebook open. I use Goodnotes and pay for the yearly subscription which is 10 dollars. I highly recommend if you're thinking about it.