Since you can get the ESV for free on the Kindle, why pay $16.75? I have both but prefer OliveTree for the reasons listed here plus the fact that I’m eventually going to buy (when I get more iTunes cards) the Greek and Hebrew bundle. The Kindle doesn’t have the NA27 and even if it did, it doesn’t do split screens.
BTW, speaking of Kindle, Amazon is launching a 9.7 inch Kindle for $489! The price violates my you-might-as-well-get-a-laptop-for-that-price policy. Can’t buy any gadget over $400 for that reason.