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…
How is the keyboard broken? Maybe I'm so used to whatever it is that I'm blind to it.
2. The keyboard's AI will also helpfully misinterpret key presses and sub the wrong letter, which doesn't get corrected. For example, common acronyms get corrected to other acronyms I _never_ use. FFS turns into FFA regularly.