I would really love to use Kagi, but the only thing holding me back is being able to type in my query from the Safari url/omni/mega/awesome/whatever-it-is-called bar. There are hacks to redirect search engines to Kagi but that adds extra waiting time and from my experience removes the ability to fallback to a different search engine. I know that this behavior is one that Apple forbids changes to and that I could get around this by using Orion or a different browser, but I use the Safari Tab Groups feature frequently which AFAIK, Orion does not have.
I did use both products in their closed beta forms, and I genuinely enjoyed using them, but inertia kept me on Apple's browser. Great to see the positivity in the thread!
Edit: it seems they've fixed my gripes with Kagi search in Safari since the last time I used it! Just paid for premium!