Netflix for books

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My favorite part of Oyster is that you can pick up or put down as many books as you want, so there's no pressure to read stuff you're not into. Oh, and we now have half a million books to choose from! If you guys want to give it a try, we're giving away $15 of free reading for PH-ers.
We also have limited-edition book posters for Moby Dick, Huck Finn, The Secret Garden, and Peter Pan, and we're only printing 200 of each. oysterbooks.com/gifts
I really like the idea! What would you say is your biggest differentiator from an online public library?