Some of the kindles allow you to listen to audiobooks on them. You have to use your computer to load them up but you can listen to them. Before I had a dedicated e-ink device I used to read books on my iPhone which at the time I found ok. However once I got a dedicated e-ink reader I found it difficult to read for extended periods on any LCD display. I'd always pick my kindle over any of my LCD type devices.
The e-ink displays do seem to do better outside in the sunshine and their matte screens help in that respect as well. The Bluefire reader I have has a customisation setting that mimics e-ink tones and that works fine for me.