As a Kagi subscriber, I find this to be mostly useful. I'd say I do about 50% standard Kagi searches, 50% Kagi assistant searches/conversations. This new ability to change the level of "research" performed can be genuinely useful in certain contexts. That said, I probably expect to use this new "research assistant" once or twice a month.

Same, I'm quite happy with it. I first subscribed because I was fed up with the promoted results in Google but now I find their assistant searches actually useful too.

I'd say the most useful part for me is appending ? / !quick / !research directly from the browser search bar to a query