I've been using Kagi for a few years. I'd say that the biggest thing to me about it is that it does exactly what so many other sites nowadays seem to hate. It stays out of your way and allows itself to blend into the background, no sudden UI changes, no pop ups advertising some way to get more money from me and no sudden drops in result quality.

I absolutely adore the ability to block/downrank domains. With Reddit trying to require logins to view the old layout, it's been nice knowing that I can just stop having reddit show up in search results.