I tried using DDG a while ago. For most things it worked fine, but my biggest (only real) issue with it came when searching for solutions to technical problems.
For example, say I'm programming and I run into some obscure error message generated by some 3rd party library. From what I remember, DDG (in general) tended to require more fine tuning of the search query than Google in order to find in order for me to find the information I was looking for.
Unfortunately I can't think of an example of the top of my head, as this was awhile ago.
edit:
Another example: Say I remember an obscure forum post from months ago. Which search engine is more likely to find it? DDG is great, but it still needs to improve somewhat in these areas before I switch over to it entirely.
For example, say I'm programming and I run into some obscure error message generated by some 3rd party library. From what I remember, DDG (in general) tended to require more fine tuning of the search query than Google in order to find in order for me to find the information I was looking for.
Unfortunately I can't think of an example of the top of my head, as this was awhile ago.
edit:
Another example: Say I remember an obscure forum post from months ago. Which search engine is more likely to find it? DDG is great, but it still needs to improve somewhat in these areas before I switch over to it entirely.