I've been daily-driving Bing for a few years now, and the only time I switch to Google is for searches on obscure programming errors. I've otherwise had no issues finding anything.

This is what killed Bing for me. I work at a .NET heavy company and it seemed like Bing was pushing (possibly not intentionally) MSDN and MS forums pretty hard. That generally was not where the answers to my questions were, and after a while I just gave up on it.

I tried DDG for a while. Search results were pretty good for me (and w! so! etc are nice), but google is so much faster. That takes capital investment, for local centers around the world. I'll try bing for a while.

I used it for 3 weeks in china, it is really bad compared to google imo. I could not wait to switch back.