For ebooks, I'll side load, but for audio recordings (and for my style of use) I find it easier to stay mostly in the Audible sandbox. I have a bunch of other recordings, but I mostly don't use them, cuz Audible is easier. So anyway, I bought the GKChesterton set. The worst part will be keeping the chart of chapter number vs. short story start handy when I'm listening in the car, and only want one story.