In short: Yes, I do think it's valid. But, I read it when it came out 2 years ago, and that was a fairly quick read through because it was so novel. My mind was so blown by the ideas in it that I knew I'd need a long time to let it sink in. So reading it aloud has given me that time to think deeply about its foundations, implications, and applications. Ever time I record, I wonder if when I get to the end again, I'll spot some glaring error or something that just doesn't work. The biggest open question people had was whether it was really feasible for Bitcoin to secure anything other than itself, and that's the last part that I'm going through now. So I guess, until I've spoken aloud ever single word in it, I'll withhold final judgement.