I've also been using Kagi for ~1 month and god can I testify for how fantastic it's been. You have to TRY to find blogspam and the allowance of blacklisting domains plus some other handy search customization features make it an absolute joy to use.
It may lack "instant answer" widgets or other fancy search engine features but it gets the actual "search" part of the equation so right that I find it astonishing how I ever used DDG/Google in the past.
Yeah I've flicked it on a couple times but rarely notice much change, though honestly it's not a search engine feature I've come to desire, as even if you get a widget the majority of the time it may parse incorrect data or not even show what you wanted (which happens a lot with google's widgets IIRC).
It may lack "instant answer" widgets or other fancy search engine features but it gets the actual "search" part of the equation so right that I find it astonishing how I ever used DDG/Google in the past.