E Ink is an electronic display technology that uses microcapsules with charged particles to create an image through changes in reflectivity rather than light emission.
I don't think this will be more efficient than having a notebook, textbook, and folder with you. Sure, the more traditional setup adds more bulk to your daily carry, but it lets you multitask with ease, and you'll never have to worry about technology getting in the way. Beyond the basics, it takes time to get extremely proficient with an e-paper notebook. That's where most people can get hung up. The Note Air5 C lets you jot down notes like usual, but is it faster than pen and paper? I'd say that it's better to use something like the Boox as a complementary piece if you're interested. Master i