I hunted for several years with a 54 cal percussion side by side, rifled barrels. The main thing I didn't like that well, and finally got tired if was that it was heavy, but that second shot was nice, and I took several deer with it.
I still have a side by side 10ga percussion, and it's lighter, so I like it better.
But I am getting into flinters now. However, I am getting to where I prefer a resonably light gun, so for me the double rifles are probaby a thing of the past. They are neat weapons, I don't know if I have ever even got to hold a double flinter. It would be a handful.