I have been using the 5.87 builds from Olimex and they seem to work fine (but it's still stretch-based). I might try some of the 5.83 builds when I have time.
The board has Rev.E printed on it, and it is the "industrial component" variant A64-OLinuXino-2Ge8G-IND. Is that what you asked?
It is powered using a SY0605E adapter Olimex sells as compatible with the board and a LIPO battery as a backup. It is a 1.2A supply nominally, but acording to my wattmeter the consumption peaks at over 8 W – not sure whether this is because of the losses on the power supply or whether the board itself draws more than the 1.2 A nominally provided by the supply.
In any case, the 5.87 build has been runing stably (right now I am using the bootloader, kernel and firmware from the 5.87 build, but all the other SW comes from Debian Buster; and it works as long as I don't accidentally update the armbian-specific parts).