So far, what I like about iBooks is the beauty of it. If you are not in the sunlight, the screen is stunning. The font sizes and styles are easy to change as is the brightness level.
iBook Sample Page
What I don't like:
*The size of the store - Amazon's Kindle Store and eReader have more selections.
*No companion app for the iPhone or computer.
The eReader app is my favorite on the iPhone, but they haven't upgraded the resolution to read full screen on the iPad. The Kindle looks good (but not great) on both devices.
My solution....By process of elimination, for now, I will only buy books on the Kindle app. That way I can read on my iPad and iPhone.
Kindle Sample Page
~Posted using BlogPress from my iPad