The screen size is important, as you say. I use a 9" reader and it is large enough, but it is a 7-year-old device. I got the impression that those larger screen

The screen size is important, as you say. I use a 9" reader and it is large enough, but it is a 7-year-old device. I got the impression that those larger screen sizes later disappeared from the market. As for the back and forth scrolling, again correct that it is much slower than with a physical book. You can pack a lot of technical books in your device but, in my opinion, the best ones it is a good idea to have them printed as well.