REally enjoying it. It picks up where you left off in iBooks as well
Nicely designed, I think.
[edit] I've found one possible issue... no sideloading. I was hoping that this app would allow a sideload, but it doesnt. You can download from Librivox and a couple of other places, and these downloads don't insert themselves into ibooks/itunes, but your own stuff seems to need to be sent via itunes/ibooks. More research and use needed.
[edit #2] You seem to be able to buy from the iBook store from inside the app, although when I tried to get a free exerpt, it didnt seem to connect at the redirect to the store, so I won't bother.