I've been using it for several months since the developer beta came out; overall I'm extremely positive on it. One of their better releases that seemingly focused more on quality and refinements than new-features. Siri is definitely worth using now, even if it remains still a work-in-progress/needs continued refinement. It can surprise you in good ways, but it isn't consistently good yet. The keyboard remains unfixed…
I normally don't complain that iOS/MacOS isn't customizable because the defaults are good enough to work for me but that voice to text man its like they completely forgot about it.