I have two Navy Arms, Wells Fargo Models, consecuively S/N'd, with the 5" barrels. Between main matches and practice I have loaded (by actual count) in excess of 20,000 rounds of 45 colt ammunition for these two revolvers and my main match rifle. Since I practice much more with the revolvers than I do with the rifle, I would estimate that I have shot 7,000 to 8,000 rounds through each of these revolvers in the last 5 years. They have not given any problems as far as reliability is concerned and the only thing needed is to give them a good cleaning now and then and check all screws for tightness once in awhile. The screws do tend to loosen up after several hundred rounds. I don't know if this is a problem with the Colts and the Colt clones also as I have never owned either.
The only modifications that I have done to them is to remove about the top half of the front sight to get them to shoot to point of aim at 7 yards and lighten the tension on the mainspring for smoother operation.
I enjoy shooting them and would recommend them for anyone that wants something a little different from the norm.
As noted in the other posts, they don't handle black powder well, you have to keep your finger off the trigger when cocking because of the transfer bar safety feature and the Cimarron guns were a piece of S**T (this is the voice of experience talking on the Cimarron guns).
Rich Heller