In reply to Sam Beaton:
To be fair, me too
That said, I have used the App a lot more lately. Now that we've got a one year old within our lives, whenever we go out climbing space is at something of a premium because of the all the general life clutter required to keep a child alive. As a result I've tended to leave the guidebook at home simply to save on space/weight.
I still prefer paper though, same with other books. I have enough screen time in my life whilst working, plus there's something wholesome about holding an actual book.