Coolermaster RP-550-PCAA-E2 - just poor or actually dangerous?

[Quartz]

A mate has just purchased a Coolermaster RP-550-PCAA-E2 PSU second hand. He doesn't need to power anything with a large power draw but is going to power a modest GPU and an i7-8700. I can tell from the label that it's not very good but is it actually dangerous?

The label made me recoil:

A quick search doesn't bring up much, with the preferred result being the -PCAR-E3. The review of that from Hardware Secrets does not inspire confidence.

Cooler Master eXtreme Power Plus 550 W burned while we tried to pull 550 W from it at high temperatures.

Efficiency was always below 80%, varying between 73.2% and 77.5%, depending on the load.

...

Although some can see Cooler Master eXtreme Power Plus 550 W as an option if you are not going to pull 550 W from it, we can’t recommend this unit, as it burns if you try to pull its rated wattage. Its main technical problem is efficiency, between 73.2% and 77.5%, which would prevent us from recommending this unit even if it could deliver its labeled power.

...

You see, this unit is a renamed Seventeam ST-500BAZ, a 500 W power supply that has already been discontinued by the manufacturer – no wonder it couldn’t deliver its labeled power.