I use ddg myself and as much as I like it, it's still quite a bit away from Google in quality of search results. Usually it's good enough, but I still get result pages where ddg has nothing I want and appending !g gives me what I want in #1
I switched my phone to DDG a few months ago because I was sick of crappy AMP pages. I find the results to be decent for quick searches but not helpful for really researching something–which I'm okay with since I don't usually do heavy research on my phone and I can add a !g if I'm not getting what I need.
Have been using DuckDuckGo as primary search engine for more than a year. It's OK for many cases but the search results aren't yet there in terms of quality or relevance in many cases. Even searching for AMP shows the AMP spec page after some almost useless dictionary sites, in the search results.