So far the experience has been better than with the Mono releases, but I am facing an issue where the Emby server will shut down or won’t be able to connect randomly. The only way to fix is to reboot, and then it takes a bit of time to get back online. I’m not sure if the issue is because of LibreELEC 9, or because of the experimental nature of this addon.
I will probably end up reinstalling LibreELEC completely and installing this addon from scratch to see if the result is any different.