Having seen, handled and shot Marlin's version, the Wild West breakdown version, and the Ashley/Clay version, I have to say that the Ashley/Clay rifle is so head and shoulders above the others that any comparisons between them are wholly and totally unfair.
Nevertheless, I will make the comparisons.
Aside from some rather snotty customer service issues reported with Wild West, their engineering of the breakdown weapon pales in light of the Ashley/Clay achievment. As Rich Noted above, the Ashley/Clay rifle embodies a lot of features that were never considered on the tooexpensiveforwhatchaget Wild West Co-Pilot gun.
The Marlin factory version has had a lot of barrel problems due to the hideously deep roll stamping on the relatively thin barrel causing bore restrictions and terrible accuracy (4-6+ moa) with the factory barrel. The actions are rather rough, and need work. The factory sights are, well... factory sights. They saved some money here for sure.
The porting is superfluos at best, and a liability in low light shooting. Guess when the big critters come out??
Definitely NOT a weapon that I would use as a bear gun right out of the box, and the mods needed to make it sufficient for the task are expensive enough that one should consider going for a full up custom like the Ashley/Clay.
Although I am not personally a big lever gun fan, i do like to see weapons designed and built correctly in whatever format the maker chooses. Marlin and Wild West both need to go back to the drawing board, and maybe shake a bit more manufacturing budget money loose from their bean counters along the way.
Ashley Emerson and David Clay have exceeded themselves.