The ones with back-light are really helpful if you want to read in low-light. Generally those are the ones that cost more. If you do such things than they becom

The ones with back-light are really helpful if you want to read in low-light. Generally those are the ones that cost more. If you do such things than they become quite useful. I own one and I use it all the time. It's way better than turning on the light in the bedroom and bother my girlfriend. Now she doesn't realize that I don't fall asleep until 3-4 AM. :)