Interesting observation. It's very subtle, but potentially important. As for myself, I don't think there's a big difference. I use Google Instant just to help

Interesting observation. It's very subtle, but potentially important. As for myself, I don't think there's a big difference. I use Google Instant just to help me form my queries, because my query changes as I see the intermediate results. The paid results and the first organic results help me see if my query really is going to give me the most relevant results, otherwise I try modifying the query a little bit. When I'm done with that phase I click search, which removes the suggestion box, finalizes the results, and then I scroll down and open whatever results appear promising.