I just started using it a few days ago after hearing about it here.

So far, it feels transformational for my productivity. I've been using the ChatGPT and Claude webapps a few times a week for specific problems for a year, but this level of integration makes a big difference. Particularly for parts of the stack I'm not super experienced with -- I'm a backend/ML developer, but I was putting together a web UI with Tailwind for a personal project yesterday. I highlighted the ~20 lines of HTML for a menu bar, pressed Cmd+K and typed "can you make this take up a little less space on mobile?" and it adjusted the breakpoints and sizes of multiple elements perfectly. Pretty cool stuff.