I've shot two cans (roughly 2,400 rounds) of the Romanian so far with pretty good results.
I've had bad luck with the Bulgarian and Czech. Primer blowouts were the main problem. The Czech I had was 50's vintage, can't recall what age the Bulgo was exactly, but it was early cold-war also.
The Bulgarian may have been worse than usual as the can I got had the seals compromised, probably ages ago. The dinky little paper wrappers had degraded into purple and tan wood-pulp, and the ammo was discolored. Smelled like chemical eggfarts when fired. Horrendous. It will choke you out if you get a lungfull. The other commie 7.62x25 smells terrible also, but that Bulgarian will clear an indoor range in a hurry.