I would think most copies, being copies, would not be as good as the originals.
I have sometimes marvelled at crude cameras that work magnificently. I've had a couple of Praktiflex SLRs, when I took one apart I couldn't believe the entire advance mechanism was built with steel gears, rust and all. I was surprised because these cameras have nearly the smoothest action on the film advance as I've encountered on any camera at any cost. Weird huh?