The S20fe 5g is flat and has OLED. The flat screen is the reason I bought it. Still running as well as day one three years later. I have noticed a slight dip in battery life lately but I can get through a whole day with maybe 35% left. When this one dies, I will probably get another.
Turn Left at Orion is a great book to have alongside your scope! I believe it is broken down into seasons and what is viewable at those times.