Tablets are back lit though aren't they. I have my books on an ipad but I only use it if I have forgotten my kindle. Much better screen on a kindle imo.
My wife replaced her kindle with a kindle paperwhite and finds it a big leap forward from the original she's had for a few years. I am pretty impressed with the updates. It shows the cover of the books now and when you open it, it goes straight to the page you are at. Controls are much more...