I use Kagi Ultimate, and I have gone though a valley of language model usage. I started using them a lot when I first got Ultimate to play around with them and understand their limitations. I stopped using them as much in favor of plain search after I hit those limitations. Models have since gotten considerably better, and in many cases they are more useful than regular web searches, so I have started using them a lot again.
I also run Llama 3 locally on a 7900 XTX to process information that I don't feel comfortable with / can't share with external APIs. That's definitely not the greatest, but it's also definitely good enough to be useful in a pinch sometimes.