I tried it long ago and it felt stripped down at that time and I didn't think I was getting full results. Because of security concerns with Google search, i decided to give DuckDuckGo a fair try a last year. After getting used to the less flashy look and fewer fancy paid search results at the top of the page - it has been my default now on my phone along with home and work PC's. After getting used to the look and feel, I get everything I need.
I had to get used to that change in "feel" - which is what most people notice the most. Google has put a HUGE amount of time and money into just the look/feel of their pages (you could write a thesis on that alone) and DDG doesn't have that same feel, but I can say that the actual results I get between the 2 engines are nearly identical with the exception of the paid results. Now that I am used to the feel of he page - i'm glad I decided to use it and give it a fair shake.
I have it on my iPad, I use it when google’s advertising ranking gets in the way, clears out the clutter. it is not as all encompassing as google but is pretty clean. For those that” tried it once” it has been heavily updated over time.
My 'dive' into it would have been within the last couple of months. I tried searches for the same topic on Google, Bing, Yahoo & DgD.... I was quite surprised and as such, keep DgD available but rarely use it.