I know what you were saying with the looking up part. But you have to be more specific. Just the head is completely different. And its not natural, try looking up and you'll see that you will arch your back somewhat as well as bend the knees if its "way up there", just moving your head isn't natural at all. (where the head goes the body follows).
I think Sonny said it best that its hit and miss all across the lines with that one.

So they can look up, they just can't look up with just their heads - which I figure is a good thing because the neck looks weirder that way with the pop-on/off heads.

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