I use it, I like it, though there is something in the back of my mind about the company that sets off alarm bells that I can’t quite put my finger on so I’m cautious. But I don’t mind the model of paying for online services in principle. I would say it’s about as good as DuckDuckGo was 10 years ago when it was still good (DDG has gone downhill like a lot of things in my opinion), and Kagi is the best search I can find now. I do research for work so I need the unlimited (middle) tier since I use a lot of search, I consider it reasonable value for money. I suggest doing the free trial and see how long it takes to run out before deciding which tier to choose.