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If I see a referral like the one below in my logs files then I know I am ranked between 31 and 40 for - blue widget - (i.e. start=30 and no num=100 advanced search stuff). Of course you need somebody to visit your site from google for that keyword for this approach to work.
So in general, you'll get a little different placement. If you're a end-user looking for something, it's nice to just be able to scroll down all the listings. If you're trying to determine standard average joe user placement, you should do it the old fashion way. (one page at a time)