Installed it yesterday and it's been working fine so far. I don't use the new gesture navigation options because it says they are not compatible with Nova. But even so, it feels very quick and responsive, the battery life is still very good, and I really have no complaints at this point.
Android 10 Official public release is on my Essential Ph-1 now and works fine. Didn't have Android 10 Beta first. Updated from Android Pie directly.
Note: After downloading and installing, when asked to Restart your Essential Ph1 make sure you restart your Ph1 the usual way and be very patient for restart to happen. it takes much longer to restart than past 0S systems.