Well, TBH, there are no pros.
This is a bad PSU. I guess it may have been cheap? Cheap, in terms of PSU mean poor quality, and trouble.
The fact there are no reviews about this unit tells you all you need to know. No-one here in this forum would advice another forum member to buy one of these.
It's highly likely it doesn't even output 500w on it's main voltage rail. It could actually be as little as 350w depending on some factors.
Depending on what system you have (list your other specs), I would simply advise you to throw that in the bin, and buy something decent so you don't kill your computer or set your house on fire.
The PSU is the heart of your system. Would you want the heart to be faulty, and ready to break down at any time? No. Definately consider getting something better than that.