It does not use reflective glass, so it can read well even in the sun. It’s more like a typeface, so even reading for a long time won’t hurt your eyes like LCDs.
There is no blue light, so you don’t have to worry about not sleeping when you read at night. (Blue light disturbs sleep at night)The disadvantages are: Refresh rate is not as fast as regular smartphone displays, so it is not responsive. With no backlit, you need to get help from another light source to see in the dark.