Hadn't really heard that myself, regarding quality, but I'm not sure.
However, early Cattleman had a leaf spring on the hand and more recent have a coil hand spring. At first only Cimarron Model P's had the coil spring, but then Uberti started putting it in all the Cattleman. I'm not sure when that was. At least 10 years ago I think, maybe more. Also, the Model P had better steel in the cylinder and barrel, and again Uberti decided it was easier to just use the same steel for all the guns so the Cattleman got the better steel as well. Again, not real sure when, 10 years ago or more I'd guess.
And if you buy a black powder frame model, the older ones use a smaller size basepin screw that is hard to find. Can't give you a year on that either. I'm just full of vagueness, aren't I?
Maybe some other pards will chime in who know a little more detail.
Welcome to CasCity by the way!