My experience with DDG has been very similar to the one cited by aw3c2: I used it as my primary search engine for a couple of months, and eventually found myself always using !g, so I switched back to google.

On programming searches DDG goes better for me (than Google) because it uses the English data. Google insists on using Spanish data even though I disallow results in other languages than English or Catalan.

For other searches, mostly local information but if it's something recent too, Google goes better. So I use DDG at work, and Google at home.