I'm getting quite confused by the ever greater number of LCD e-readers - the iPad, the Nook, the Kindle Fire and now the Vox. What about the eyestrain issue? I though the whole point of e-ink was that it is difficult to read for long periods on a backlit screen without eyestrain?? I notice the Vox press release mentions a screen technology called 'AFFS+' but I have no idea what difference, if any, this will make