The problem with the IPad (as a book reader) is that you have to charge it everyday. I'm not sure how long it takes to boot up, but my Kindle turns on in seconds. And I don't have to charge it for about two weeks. And the Ipad is not readable outdoors since it's LCD based. So for the ebook market, I can't imagine Ipad beating the Kindle.
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Denon 4520, EPIC80/500/VP180 Speakers