QS is annoying! Well, in theory it's not a bad idea, but I've not been impressed by it's implementation. As far as studies, I'm not sure how possible it is to conduct a reliable study/test on it... it's always changing and there are too many different variables that just can't be separated. Plus Google doesn't tell anyone anything actually useful about the way they come up with it.
I assume you've been to WebmasterWorld to do some reading on it if you're interested? www.webmasterworld.com/forum81/
It's not that I'm lazy, it's that I just don't care.
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