Curious, why not use your phone for both these use cases? Seems like it would be even more convenient
I do use the phone for audible, but I started both uses before I had a smart phone (I was very late to the game), and I am a creature of habit. Plus the netbook has a bigger display, more storage, and a real keyboard (again, creature of habit).
I can't speak for the other poster, but I like the idea a lot. Having tools with specific purposes means I can avoid using my phone for everything. No matter what games I play to remove notifications/interruptions/etc. it's always a distraction and easy to be distracted from whatever I originally intended to use the phone for.