I've used it for years, in preference to Google, in an attempt to keep at least a little bit of my life out of their clutches.
The results are not as all-encompassing as Google's, but if you can't find what you are looking for, adding the two characters !g to your search string, will cause DuckDuckGo to send an anonymous search to Google. However, the results are returned directly from Google, so if you click on a link on that page, Caveat Scrutator!