I bought the Kindle when it first out and loved it but never carried it with me, and found it difficult to read at night - so as soon as reader version came out for my Android, I used that and never looked back.

Reading in bed with a smartphone is great because the light does not bother my partner, and after two minutes of my falling asleep, the phone switches off its screen as well. Any bed lamp I use keeps me awake rather than allowing me to fall asleep.

(I know I am the exception as I have been reading on Palm Pilot screens since the late 90s - it was the only way to make sure I could get enough reading time in medical school.)