I have the NP-34 Sig P228 copy. It has its advantages and disadvantages. Thanks to the Sig design it is light, and easy to strip and clean. It is also reliable and feeds anything. Recoil is a bit jumpy but far from punishing and the sights tend to reset themselves.
BUT. The sights suck. You can't aim precisely with them. I find they are great for minute of silhouette target at 10-25 yards. I can hit 9 or even 10/10 repeatedly. I can only get good groups at extreme close range below 10 yards. DA trigger is horrible, though SA trigger is good. Hammer is a bit stiff. Some people hate the grips - I liked them until a screw worked itself loose.
In short, the NP-34 is really fun but lacking in the accuracy department (the horrible things I did to its barrel as a cleaning novice may have something to do with that though). Also, I hear that the NP-34 will break down (parts wear or fail) more easily than other pistols, and has nothing on the real Sig in terms of robustness. However, I have found it perfect for teaching newbies to enjoy shooting, as everyone loves it and it is hard to put down.
To put it another way, the Norinco 1911A1 is a firearm I would consider spending more money on to make it better. I would not do the same, or at least as much, for the NP-34. I also have a Norinco Tokarev but it is kinda boring and plain vanilla, at least for me. Lotsa fire and recoil though, for those who like that sort of thing. No frills, no fancy sight, though, etc...