I'm generally pretty happy with the results in Qwant.
The main thing I miss at this point is really support for !bangs. I use them all the time in DuckDuckGo, to search directly in !scholar or !wiki. Especially in Qwant there are some features missing, so if I for example want to be lazy and use the search bar as a calculator it would be nice to be able to search for !ddg 2+2
.
But that's a minor criticism. For the most part it's a great tool, and I look forward to where they go with their own indexes.
Edit: Also, what's up with this graphic suggesting search engines (if you can call them that) as alternatives to Google Chrome.