I went tonight and really enjoyed it. I was engrossed. Simon has such a way or enveloping you into what he's saying and believing, and it's great. The theater sort of melts away and you're left in your own little bubble of thought. The story was at times engrossing and interesting, and at times very meta and allowing your mind to wander. His performance is incredible! The sound design is gorgeous and flawless. I don't know who said the show didn't have projections, but they were stunning. I loved when the wall turns green and starts to slowly sway in the wind. It's a total mind f**k because you know nothing is really moving. Much like this show. You know their aren't crickets behind you, someone talking behind you, or an actual door opening, but your mind believes it.
I would say it's much more than an audiobook because, for one, you're watching/listening to him create it. You see him pressing the looping button and looping his vocals, you see him create the sounds, you see him switching back and forth from character to character. And to me, as an artist/actor/writer, I found all that fascinating. And then to layer in the broader story about memories and stuff mixed with this really interesting stranger in a new land type sorry, I was into it. And I think your mind wanders a bit because his is. He's meandering and just stream of conscious...
Seating note: I was in the rear Mezz - which could use some leg room - but I'd totally recommend that view. Lots of projections on the stage floor that I'd think you'd miss other wise.