I have a Cattleman in .357 with a 5 1/2" barrel and the antique finish. As with any fixed-sight firearm, it can be a bit off for any given shooter. Mine shoots low and to the right for me. Of course, adjusting fixed sights is not impossible by any stretch, just less convenient.
I've been running both magnum loads and .38 special rounds through it and have not had any issues. I never got to test Uberti's Canadian warranty, 'cause I've never had a lick of trouble from it.