I pick up brass at the range and reload it. When I find the PPU cases I get a little extra thrill, like finding a quarter when you thought you found a nickel. I'd use it without hestiation.
By the way, this company sells munitions loading equipment AND consulting services for making ammo. I would venture they know their stuff.
I have used this ammo in 10mm, 9mm, .45 and .38 S&W. I have never had one issue with the ammo. It has always performed as stated and has been a pretty clean firing round as well. I especially like the 10mm. I had some jamming issues with other manufacturers.
I have tons of PPU ammo have a friend in the North he sends me it all the time I am from BOSNIA and I get the ammo from Serbia sometimes to there is a PPU Prvi Partizan small factory in the north also