Unfortunately, no one has any first-hand info on PSA's AKs. They discovered headspacing issues on their first batch and pulled them off the market. It's a shame because I was actually pretty excited about the barreled-receivers they were going to be selling. I'm actually surprised their supplier isn't back on line yet - it feels like it's been a while since they went away.
As far the the "Kalashnikov Concern" rifle you linked to (#2), it's just a partially converted Saiga from a company with a dubious reputation. Nothing wrong with it I suppose, but by the time you finish converting the front-end (and replacing the parts from their rear-end conversion) it would probably have been easier and cheaper to have just (found and) bought a base Saiga and converted it yourself.