Posted 03 May 2012 - 04:14
I've used it several times.
It doesn't flood your results page with adverts and is clean of privacy issues.
Also, it is associated with something called duckduckhack, that is, snippets of a probable result being shown straightaway upon the search.
People seem to like the cleanliness etc.
Of course, the real question is the search results and whether it is able to generate 'em as good as Google or Bing do.