Nightcrawler,
Those are not Beretta mags. They are made by Vektor for a couple of South African pistols which have frames almost identical to the Beretta 92.
I have 10 of them and have handled around 15. They are VERY good quality. The mag bodies are made of thicker sheet metal than any Beretta mags I've seen and are case hardened. Springs are strong, and the floorplates & followers are aluminum.
However since they are not exactly Beretta mags, you may have to fiddle with them a bit to get them to work. I had a couple that wouldn't lock the slide back, or that wouldn't latch into the gun.
I fixed nearly all the problems by just switching followers and floorplates around, but I did have to open up the mag-catch hole on one of the mags that wouldn't latch in. Ruined a needle file in the process--that case hardening is really tough! (Probably should have used a Dremel) Anyway, I got them all working and have had no function problems since the initial glitches. They are very sturdy--I don't expect them to wear out in my lifetime.
Beretta springs and followers work in the mags (although the original parts may be sturdier), but the Beretta floorplates won't work since the sheetmetal is thicker on the Vektor mags. That may irk you a bit since the floorplates are painted aluminum and the paint will flake off pretty easily. They are also a bit oversize compared to the Beretta floorplates. Not so you'ld immediately notice it, but if you are a stickler for details, it may stick in your craw.
I highly recommend them--IMO, if you're willing to do the initial fiddling to get them working they are probably the best Beretta 92 mags on the market.
Good shooting,
John