From my own experience, the AI built-in to Kagi is excellent. I frequently suffix my query with a question mark to trigger their AI responder (it responds based on the content of a few top results, with citations), and the results are almost always great, and spare me the need to open each of the sites individually and look through them.

I don't care about Orion and Email, but what I'm getting right now in terms of search experience is definitely worth the cost.