In general we've preferred physical books for the kid, mostly from the library, a few purchased, for obvious reasons. but planning to be in some situations where the extra weight from objects such as books & superfluous devices (we do have an old kindle that we've used a *little*) would actually be a big problem, so we were trying to consolidate down to the iOS app, not to mention selectively share mom & dad's decades-old back catalog of various ebooks. and it just doesn't work at all