I have the Ipad kindle app and its fantastic. Mind you so is ibooks. Never thought I would get used to reading off an ereader as we love books so much. Yes youre right the feel of a book is something that will never be replaced but the ipad is so much more convenient when Im travelling for work.
Have a look on for a book called Penetrating Wagners Ring. Its supposed to be about, amazingly enough, the ring cycle. But just look at some of the comments makes me crack up.