The addition of offline reading just took the Logos app from useful to indispensable for me!
I find my reading of books has almost doubled since this app came out. It's perfect while waiting for meetings (people are always late when you don't have anything to read!) and almost anything else. And now that I don't have search for a hotspot for my iPod Touch I am truly free to read on the fly.
Now, if syncing to my highlights, notes, and prayerlists were possible, I think we'd have the world's finest app.