I never could get comfortable with electronic books. Since I drive long hours for work, I do take in a lot of audio books on the open highway. I always have an audio book in my player and a paper book on the nightstand. Lighter fare is good while driving. I’ve found that anything requiring studious attention is best read on paper.
My frau used audio books when she was working in Jefferson City MO and flying onto St Louis or KC.
I cannot do audio books. I prefer real books for my history library but, if I can get a $40 for $10 on kindle I will do that. I also tryout scifi fi series on kindle. I do not highlight books or write in them but have tabs sticking out all over. Usually I need a decent map up on my phone or have the board wargame map available as most history book maps are not good.