1st, the positives: • This set of BluRays have stunning visuals, from the first disc to the last. • The amount of information does not overwhelm, but does constantly flow, makes the learning enjoyable, without boredom. • Its a set of discs that we'll watch over and over again. • Each episode has a sub-episode that explains HOW THEY SHOT IT. It is as fascinating and educational as the main episodes Now, for my one caveat: • This has nothing to do with the quality of the programming or the discs themselves, but with the spoken narration. When I see David Attenborough's name, I know what he is going to say, and I'm ALWAYS disappointed to hear him say it. Phrases like, "approximately 65 million years ago..." or such and such beast, "has evolved the ability to..." do this or that. Nonsense. Everything is going along fine: great instruction, camera work, the science of what is occurring, and then blips like that foolishness are irritating. Nevertheless, based on all the positive points, I really like the series, and would recommend watching.