I have never liked DuckDuckGo after seeing their advertisement tactics, especially the "educational" http://donttrack.us/ minisite. Apparently your anonymous HTTP referer info (from Google Analytics?) will be sold to insurance companies / appear in a background check? It is blatant fear mongering and really made me angry.
http://www.techspot.com/news/49975-how-ants-have-used-the-in...
If you look at http://donttrack.us/, it says your data "can potentially end up" in those places, not "will be sold to..."