I've tried the M-Edge E-luminator, and a couple other non-clip gooseneck lights. Out of them, I like the Kandle the best. I just got mine last week, and I've used it more in a week than I used any of the previous lights.
The Kandle has a nice wide, well-paddded clip, and uses two CR3032 batteries (included, along with spares) for light. I clip it right onto my Kindle with skin without any issues, dents, or scratches.