It's good.
Many of the annoyances from V1 are gone. Skills and plugins reload automatically (finally). Tasks can be backgrounded (though I think this doesn't happen automatically yet). There's a built-in skill for editing the configuration (finally I can retire mine). The front-end got some love. Apparently they re-architected the loop around Effect. Sub-sessions can be communicated with better. Configuration is loaded from the folder the session is created in rather than where the server was started.
In general, this update largely takes OpenCode into the current age features-wise and is a good overhaul quality-wise. Just in time to stop my early switching away efforts, which would've been a pain because I know few other harnesses with such a strong server/client model.