This setup makes feeding a lot easier, since you can easily put a feeder insect in the treehouse while the tarantula is in there. (In my vertical setup, there were a lot of misses that resulted in the cricket being on the ground, where an Avic would never find it.)
@Dustin Amack Yes. I put a layer of it beneath the substrate as padding in the event of a fall.
When I set up this enclosure, I was paranoid about falls, because I had seen her repeatedly fall from the smooth plastic lid in the Kritter Keeper she came in. If I were setting up a new Avic enclosure, I would not bother with that extra safety measure.