I'm sure HD is "better" but the question is for better for what? I think if you are just looking to post stuff up on YouTube it's likely not worth it. If you want to play it back full screen on your PC or TV then sure.
I posted up some reasonably well encoded videos from the standard version here:
viewtopic.php?p=2313#p2313 - they are 1mb streams.
I also created some for YouTube that you can look at here:
http://www.youtube.com/user/trackwhores#play/allYou can certainly see the difference formats and encoding make between the two.
The reason that their stuff looks good is because they are picking out the best they have so they can sell their cameras, they also have quite a bit of experience obviously with their product so they can extract the best from it.
Much of the crap quality you see in owner videos has to do with both the way they were shot and the way they were encoded (compressed down) from the original AVI the camera produces.
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