Working very well, also with other better tubes, :-) :-) :-)
The version with the case doesn't use an Arduino, but it does have some headers on it that can maybe be used for flashing. I'll need to give the PCB another look over for package serial numbers but I did see a CH340, which is good. Tested with an Americium-241 source, seems to read fine. Very cool for the price, but kinda disappointed it was preassembled.