I have a Supernote Manta that I use for note taking mostly, but it also is a great ebook reader. No light on it at all, the optimized for look and feel of writing on paper really well so the tradeoff is worth it.

Recently I use it mostly for taking notes from music instruction and stuff like which synth patches to use for certain songs, or which settings to use to recreate sounds on a synth where no close-enough patch exists