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Co-authoring a book (Abraham Lincoln and the Structure of Reason, with Dan Van Haften: see http://www.thestructureofreason.com/) puts one in a unique position to evaluate Kindle v. iBook.
Abraham Lincoln and the Structure of Reason is $9.99 on Kindle. It is $16.99 as an iBook. That relative price difference seems generally within the range of other similar newly published books.
The price difference is even greater because for $9.99 one can load the Kindle version on three platforms: For instance, a free Kindle reader on a Mac desktop, a free Kindle reader on an iPhone, and a free Kindle reader on an iPad. I don’t own a Kindle machine but one could substitute the Kindle machine for an iPad.
iBooks can be used on an iPhone, iPad, or iPod touch, and can be synched to all iPhones, iPads, and iPod touches you own. But most people do not need more than one cell phone; and if you have an iPhone you don't need an iPod touch. Nor does one normally need more than one tablet. But, it is useful (for limited purposes) to be able to view a book on a desktop computer. So, in my view, Kindle’s three loads that work on three different kinds of hardware (small cell phone, a book-sized reader, and a full-sized computer) are more valuable than iBooks’ infinite loadability on an infinite number of iPhones, iPads, or iPod touches. You probably have no more than two of those three that you use, and you are restricted to Apple hardware (nice as it is).
But what about features.
Kindle sparkles on Apple hardware. However, as one might expect, there are some little touch, look, and feel aspects to iBooks that make iBooks marginally superior to Kindle. Except for one such feature, most of these pluses, though real, are trivial. But there is one iBook feature that to me is significantly more than trivial. Both iBook and Kindle have a slider on the bottom of the screen to quickly move through a book. But the Kindle slider is kind of like the old UNIX command line game of "Find the Wumpus," being blind in a maze of caves. An iBook shows chapter names as you slide. This is a huge plus.
David Hirsch