I was one of the people that had a cracked frame on my NP-22 after about 2,000 rds. Both Lever and Marstar reported that they have had a few returns for this problem. Yet there are people on this board who have happily put 10,000 rds through theirs. I don’t know if the problem is unique to particular guns or that it is a systemic problem for them. I suspect that by next year you either have a lot of complaints or a lot of happy people.
The gun is a copy of the early Sig 226 with the old style springs, which will require you to modify any after market grips you get. I really enjoyed the gun and it was a joy to shoot.
I found the balance of the NP-22 superior to the NP34, but the 34 comes with almost decent grips compared to the useless grips on the NP-22. I have seen a couple of early NP-34 which were not well done and the later one seem much nicer.
Would I buy another one? I think I will wait a year to see what plays out. If you decide to get one, buy it new from someone that has a good warranty. Right now I have the NZ-85b, M93 and ordered the 1911 Commander, so I do like Norinco. But for a Sig I have my heart set on the Stainless steel one.