depends on what you want. I have never had one but hear the fit and finish is better than the piettas or other copies. for me just wanting a plinker I was happy with the pietta for a lot less money, since I only shoot it few times a year. if you wanted it for daily shooter I might consider Uberti or colt.
Uberti has had the reputation for the best fit and finish of the Italian reproductions. The interior working parts may or may not be finished as well. Function should be good in either case. For your info, the original 1851 Colt Navy was only made in .36 caliber. The .44 caliber Model 1851 is a modern creation.