I'm currently rereading Ender's Game, and I'm reading it on my iPad using iBooks. I've got Kindle, Nook, Google Play, Adobe Overdrive, and Stanza on my 'Pad, but I've mostly used the Kindle and the Nook. Our library allows us to download ebooks to the Kindle, and when I got my iPad, I had some B&N bucks from a return that I was able to use to read the Game of Thrones ebooks. I've really only used iBooks to read PDFs, but as I'm getting into Ender's Game, I'm impressed with what a nice ereader it actually is-- in fact, I'd go so far as to say it's the best ereader on the iPad.
The text is nice and crisp, the pages turn nicely, but it's the little touches that really make the difference. With Apple, it always comes down to the little touches. The spine, the fake pages, the fake back cover-- it seems a little silly and superfluous, and it is, but combined with the crisp text and nice page flipping animation, you start to forget that you're reading on a tablet, the same way that you forget you're reading a book when you get into a text. I've never had that kind of subliminal reading experience with either the Kindle or the Nook. Both of those programs never try to hide the fact that you are reading an electronic text on an electronic screen.
The iBookstore hasn't been my first destination when I'm looking for an ebook-- that will still probably be my public library. But I think I am going to look there more often than I had in the past, just for the joy of reading ebooks in iBooks.
