I don't think it was so much the design but rather Soviet influence on satellite countries that made the design so popular. When the USSR is handing you printing presses and equipment to make the guns there isn't much reason to try anything else.
Never did figure out why the Czech's went other routes, or rather, were permitted to. Glad they did though, they came up with some good stuff.
I'm a beneficiary of that.
I picked up my oldest son's gun a couple weeks ago. He had tastes like mine: high value per dollar. I just hope having a lawyer in the middle of the process didn't turn a $200 gun into a $500 gun.
This has higher capacity and better sights than my Makarov, and better ergonomics. It sits in the hand very well.
This will probably never get carried, outside of a TEOTWAWKI apocalypse situation.