Damon Lavrinc, Wired.com:
Whether developers recognize it or not, users still subconsciously desire some kind of visual feedback when flipping through multiple pages of content. Some of these visual cues are comically exaggerated (iBooks), some are more subdued (Instapaper’s “Fast Pagination” action) and others fit somewhere in between (Flipboard). But each presents a challenge to developers attempting to blend the tactility of real-world pages with the digitally native tablet aesthetic.
I hate, HATE, the faux page-flipping transition in iBooks. In my opinion, this is a good example of Apple adding skeuomorphic components that serve no purpose for the user experience. I’m not reading a book with physical pages, so to see a fake page flipping is absurd - and slow. I prefer the horizontal scrolling transitions from page to page, such as seen in the Amazon Kindle iOS app.