Very cool. One excellent feature of almost all ebook readers and apps is that you can change the font size.
I currently use my Xoom for most of my ebook reading (also my Sony 505 - e-ink). The Tablets have apps for most of the books stores - Nook, Kindle, Sony. If you want something fully integrated I'd highly suggest the Kindle Fire (and the price is excellent).
edit ... ooops I see you are in France. Kindle Fire might not be the way to go in that case...but certainly could still be used by loading books to it from the computer even if not directly. Price is still pretty good even for just that, but there are other tablets as well and they generally have Kindle Apps or Nook Apps or Aldiko or ...