Power source seems to be OK, I'll report if anything concerning eletrical functionality occures. BUT the shipping was superslow even when considering Covid-19 complications (71 days!). When the seller was contacted concerning the shipping time getting too long and the package still stucked somewhere in sorting center in China, no action was taken ang the communication wasn't too good anyway.
BEWARE - the grounding terminal was poorly connected to the case. The connection was at the best wery weak (6 Ohms measured between the case and the gronding terminal), but sometimes the connection was broken all together! Not only this make the shielding function of the case wery poor, but it is extremely dangerous in case anything goes wrong inside! DOUBLE CHECK your power source, if the connection of the case to the ground is solid! I had to put washer between the board and the grounding threaded insert of the case to solidly connect the ground. The screw was replaced with some solid one with waser under the head to be able to tight it properly. The voltage is correct and holds under load, as power source it is perfectly usable, just be sure to check the grounding! Thanks for reading.