The format is obviously made for 6 TV spots. The volumes are somewhat chronological, with significant overlap and repetition of key concepts. If you choose to watch them straight through, as I did, the repetition will become annoying. However, if you watch them one a day, or better still one every other day, the repetition is welcome. If you buy it, I strongly suggest you to not watch it straight through. I would have given it 5 *s, but the format prevents me from doing so.Notes: The "Christian bashing", mentioned by another reviewer, is not uncalled for, and I would suggest that he/she read some of the historical accounts. Some written by Christians. Lets face facts, Christianity is and has been completely intolarnant of other beliefs. Moreover, the documentary is quite complementary to Christianity. The timeline in the DVD version is very useful, as the volumes are not entirely chronological.