"good"
contained a lot of good information; covered a wide range of topics relating to earth history and the history of the universe. actually gave a pretty good treatment of dark matter, as i recall. did not have a lot of unnecessary fluff. good listen.
"worth a listen"
pretty good; contained a lot of useful information presented from a little different angle than other books that are out there. occasionally strayed from the topic, but not much. i listened to it several times, and will listen to it again, i'm sure.