At first glance they seem to be on par with ((10)) waffle mags. About a direct copy as you can get from a bulgy waffle mag IMO minus the big roll mark and a few little features which I don't mind.
Reinforced locking lugs, feed lips, and floor plate ledges.
I just got these in today and can't wait to take them out, unfortunately I'm not RobSki so I can't blast 500 rounds through them considering the ammo prices.
But I can't wait to take these out to the range this weekend hopefully. At $26 a piece, they're going to be the top polymer AK mag in the market or in general as surplus steel mags are now up to $30 for a very good condition one IMO...provided they work. They're a little tight on my FR107/CR107 conversion, but should wear in the more I use them. They fit just right on my DDI milled Bulgy AK. I can't wait till PSA releases their 103 type mags.
Edit: to add some more info
So upon further inspection of the mags, the PSA mag uses proprietary followers. Just tried to swap the bulgy follower and spring into the PSA mag and it wouldn't go in all the way to the top which is unfortunate. The mag has like rails going down inside at the top where the follower can ride on. In the first pic, they're hard to see, but they're there.
The bulgarian mag only has tabs where the follower rests against so it doesn't go all the way to the top and act as a BHO feature.
And last, this is how the follower looks. Bulgy on the left, PSA on the right. So if you use BHO followers, or any aftermarket followers, they won't work in the PSA mag without some modification.