Few notes after extensive testing
Last few days I'm using X as a daily driver and there is few rather small issues to address and I'm not sure if it's global issue or only on this device.
WIFI - sometimes when falls out of range, doesn't connect back. Sometimes connects after one reboot,sometimes needs two to catch up.
POWER OFF - when I try to reboot, often device just turn off and stays off. Sometimes reboot normally.
CAMERA - If you listen music on headphones and open Camera App, volume goes down 50% until you turn off CameraApp. Rather wierd one xD
KEYBOARD - needs to be faster xD and a bit more configurable, atleast to choose how tall it can be
Nothing of those is a deal breaker at this point, but I guess it's good to be aware of those.