I'm one of those people who simply don't feel comfortable reading a novel on a backlit screen. I have no problem with staring at my laptop screen for hours when working or watching movies, but I just cannot read a book on any kind of phone or tablet. After a short while I just can't concentrate any longer. Yes, the brightness is low, the font size and margins the most suitable for me, ditto for the background color etc. It is just something to do with a backlit screen. I cannot really explain it. All I know is I have no problem with reading a novel on my e-ink kindle, but cannot do so on a phone or a tablet.
Of course, tablets have weight issues on top of backlight issues. They are just too heavy to hold comfortably. IMHO.
