I often wake up at night and can't get back to sleep, so I want to read, but without disturbing my husband. I found a Mighty Bright clip-on book light at a bookstore many years ago and I've been using it for almost as long as I can remember. It was the old style with a small bulb that burned out after a while and had to be changed. By the time I bought my Kindle 2 the last bulb I had for it had burned out and I couldn't find any more locally.
When I saw the Mighty Bright XtraFlex2 Clip-On Light for the Kindle I decided to get it, based on the quality and reliability of my previous Mighty Bright product. As good as the old one was, the new one is infinitely better. The new one, of course, has LED bulbs that should never burn out, and has two of them for adjustable lighting. One is enough for reading, and I wondered if I'd ever use both lights at once until one night when the electric went out. Not having a flashlight handy, I grabbed the Mighty Bright and found that using both bulbs it made an excellent, very bright flashlight.
The bendable neck is much better than the "adjustable" arm on the old light, too, in that the arm was only adjustable in one direction, but the bendable neck on the new one can be moved in all directions and will stay just where it's put until you move it again.
The other day I was reading my Kindle 2 in the doctor's office while waiting for him. When he came in and saw it he told me he has one and loves it. Then he told me about having gotten this absolutely wonderful night light to use with it, and started telling me about the Mighty Bright. So I guess this is two recommendations in one -- and we both love it!