From the airline perspective... I am pretty happy to be using an ipad in lieu of carrying around pubs. I have gotten into the routine of doing the required updates prior to flight (downloads that sync with Jeppesen and our company publications), download all my weather products via our weather program and the brief, and then download the flight plan/NOTAMs etc. I don't think I have ever been below 50% of battery life even on long flights to south America. But we are required to carry around a hyperjuice battery in case that happens. If the ipad died in flight, then the other pilot (or pilots) have theirs, and we also have a paper copy of our inflight QRH to handle emergencies. A lot of redundancy there. I hope we still are on track for our tech refresh this year to a newer ipad, and that we also get chart capability with JEPPESEN.
Glad to see that the Navy is utilizing this resource more in flight school, and hopefully the fleet.