I did install it on eMMC, device doesn't seem hot, it is much better than s905x images, but i do have an issue.
Screen is not filling up the whole space, i do have black screen on the right side of my monitor, can you change the resolution, i want to use the whole screen.
Is there a way to view cpu temperatures, on Armbian builds it was armbianmonitor -m to view temperatures.
I did try 720p yt video with mozilla for a minute, video was actually watchable, device didn't look hot.
I hope you will soon solve all the remaining issues Khadas has, but this is now much better, i would say it is usable.