I alternate between my K4BNT and the PW1 every night, or so. I find I do like my K4BTNT more, but sometimes I am too lazy to hit a switch and pull the little light arm out in the middle of the night, lol. I suffer from insomnia.
I can see the K4BNT and it is a no nonsense reader, sometimes I try to touch the screen, cause I am tired and not sure which ereader I am using, lol.
But between the two readers I am fine. My K4BNT cover light covers all areas of the reader, no problems at all. I have two light screen covers (aka masking tape) and a cardboard cover as my friend has shown. Works just fine.