I owned one of these for a time.
It was a good shooter, but I sold it after a while.
Not my favourite gun, here's why.
The stock finish was some modern plastic stuff, which looked cheesy. The barrels were browned real nice, the overall architecture was neat, but the stock finish jarred in a major way.
The locks were not good. They functioned alright, but when removed from the gun the innards were very light and rough.
And, most distressingly, when for the first time I poured hot water into the barrels for a cleaning, all the water flowed out the bottom of the lower barrel. It's been awhile since I owned that gun, but as I remember, I could not figure out where that opening was: not a good deal. I continued shooting the gun for a while after that, and got no escaping gases, so I don't know what was going on, but 'twas freaky.
Hope I'm not raining on your parade too much, but IMHO, I think you could do lots better for a double percussion shotgun, especially considering the price these things bring now. Folks seem to have great luck with the Pedersolies.