And for the civil among us, talked to my friend about the 360 version just now. Initially he didn't install it and he backs up what was said by Keza at IGN. During loads the game takes hits and the pop-in is bad. He installed and those issues disappeared. The framerate is consistent with the demo, and so is the tearing. He mentioned something odd about that install, like it didn't seem like it was installing, but eventually did and now runs fine from the HD.
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That's total crap. What if you don't have a HDD?