* Google search was good, but has been steadily getting worse. Over the last 1-3 years it's become actively unplesant.
* DDG solves a lot of privacy issues, but the search quality is strictly worse than Google. I know people who use it preferentially, and I respect that, but personally Google search is already so bad than opting for something even worse is hard for me to accept. And I think almost every DDG user is familiar with having to fall back to Google to get a result.
* Kagi solves the privacy issues and the search quality is excellent - certainly better than Google is today, and subjectively, feels as good at least as good as Google was at its heyday. And notably I have never needed to fall back to Google; it's just a strict upgrade. I absolutely feel it's worth the cost.
I can't really predict if it will stay good; some of the decline in Google is no doubt just because they're the most popular SEO target, so it's possible if Kagi becomes wildly popular it'll be a victim of it's own success. And of course, Kagi's goals and principles may change with time, etc.
But as of today, if you think you might get some value from really good search, and Kagi isn't wildly out of your price range, give it a shot.