I would [i]love[/i] to integrate DDG site search into my website(s) as an alternative to major search engines and to promote DDG. But as it stands, there's a few major problems with it that unfortunately keep me from doing just that. They are:
1) The site box disappears. I'm not sure why exactly, but after trying to use it on a WP site and a different site, the search box was not visible to users after being added to the site. No, I did not accidentally erase it, update, swap a file, etc. That seemed too unreliable for me and bad PR for DDG.
2) "Try Google, Yahoo, Bing, instead". I really dislike this in the search and just seems like bad PR. Seems to admit that DDG is not a serious alternative and I do not want to promote a search alternative that touts benefits of privacy etc., that is not a serious tool.
3) The rate at which DDG finds my topics does not seem quite fast enough. I could probably deal with this problem, but then I ask myself - "why sacrifice user accessibility to promote a service that just isn't up to par?"
4) DDG results cannot load inside a page of my own site. This is something else that I could live with, but again highlights the contrasts between DDG and the big boys, and by that I really only mean Google.
I'm not sure if others feel the same way or not, but would love to hear your own experiences and would love even more to see these issues corrected to encourage webmasters to introduce users to DDG search.