One thing I noticed was you have to be careful just how much you tilt the iPad. It seemed pretty sensitive and would think you were turning it all the way and flip the view around without you intending to.
The pages on the iBook reader turned in an instant, with a cool little graphic effect of an actual page turning. I didn't have time to test out any features the iBook might have, such as setting a bookmark or enlarging the text. Hopefully, I'll be able to play around with it again (we have it at work) to see how those features might work.
Now if only someone would show up at work with a Kindle...