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For everyone asking what the difference is between BBC and US besides the narrators...here's a bit of info from highdefdigest in case you were on the border about deciding which to buy:

"This US edition of the series is different in several ways compared to the previously-released BBC edition. Among the changes made by The Discovery Channel for the US broadcast were a re-sequencing of the series' eleven episodes, a new main music theme, and the replacement of David Attenborough's narration with the decidedly less British actress/conservationist Sigourney Weaver. Most controversially, the Discovery Channel version also excised roughly 6- to 7-minutes of material out of each episode to allow for commercial interruptions. The result is a total runtime of approximately 480 minutes for the domestic version of 'Planet Earth,' versus 530 for the unexpurgated BBC edition.

While none of these revisions substantially change the power of the series (even including the substitution of Weaver for Attenborough -- I found both to be equally effective), the exclusion of nearly an hour's worth of content from this edition for non-creative reasons is a real disappointment, and leaves me no choice but to knock the content score for this edition down a full notch...

...This Discovery Channel domestic version of the series ends up being quite different from its next-gen predecessor. On the content side, over 50 minutes worth of content has been snipped, yet a half hour of supplements have been added. And while some may prefer Sigourney Weaver's narration over the BBC's David Attenborough, the video on this edition is clearly inferior to the five star BBC version.

So, which to choose? In my opinion, though the featurettes are a nice bonus, ultimately the raison d'etre of 'Planet Earth' is its stunning visuals, and its content. And with inferior video and a shorter running time, those extras ultimately aren't enough to compensate. To be sure, on its own merits, this is still a fine enough release, but if you're going to invest almost $100 bucks to purchase 'Planet Earth,' the original BBC version still gives the most bang for the buck. "

--- highdefdigest.com