I never use it and I don't think see why you would. The results are returned so fast that you can see the first site and click on it, or not, faster than a site's home page can load.
If i am confident about the keyword for which i will not lost my rankings in short while for that i would like to use. But for the particular search, you can never only rely on a single results, may be more helpful results on 2nd place .... 2nd page on... rather than 1st listing.