The VZ58 is still in service to this day. Early on, it was chambered in 7.62x45 and then was converted to 7.62x39, not at Moscow's behest but simply because of logistics. Why use proprietary ammunition when everyone around you is using the same thing, especially when your oddball cartridge isn't any better. Despite its apperance, its not an AK, but an entirely different weapon which uses an tipping block*Walther* style operating system. Nothing between a VZ58 and AKM are interchangible, save ammunition. Which is actually better is anyone's guess. The AK is world proven, the VZ is not. The VZ is machined to tighter specifications and isn't nearly as "sloppy" as a standard combloc AK of the era. The VZ is slightly more accurate, again when
compared to a contemporary. It also is a more "durable" design, less prone to incidental damage.
Keep in mind, reliability/durability aren't necessarily the same thing and while reliable, there are many things about the AKM which aren't all that durable. The main reason for countries to resist conforming to Moscow's standards would be to retain thier national identity and to possibly passively resist. Logistically, its an abusrd notion to use proprietary
weapons/magazines/cartridges when your neighbors are using "standard" stuff. Arguments can be made about the superiority of the weapon, but the magazine? I am sure they had thier reasons, but I can't tell you what those reason are. I can tell you VZ magazines appear to be more "robust" than AK magazines of the period.
I really like the OOW incarnation, as it appears to be well built. I didn't care to shoot it when I had the chance, because I didn't want it to tarnish the memory of the "real deal". The price is a little higher than I would like to see, but they seem like good guns. Do avoid the folding stock as its sloppy and extremely uncomfortable. It looks cool, but it borders on being dysfunctional.