This is radio I want to listen to, and rate it as a 5.
A 4 or 5 rating means I obviously found the piece entertaining and informative. But this is a show I would want to listen to again, maybe multiple times. Perhaps I would feel like hearing it again to pass the time on a long drive or turning in for the night...the times when I need good radio.
In terms of tone, I found it equally humorous and engaging. The 'This American Life-esque' tone only serves as a reference to its theme-driven format and quality. I believe the piece would easily match my 50 or so favorite TAL episodes.