I have experience with the scope...
For daylight shooting I thought it was ok.
When it comes to dark shadows and early morning or later evening light situations, it suffered terribly. I quickly learned the true measure of an optic, in my opinion, is not only it's clarity, but it's ability to see into the shadows and under lowlight conditions. Every whitetail hunter knows the first few minutes of early morning shooting light and the last few minutes of last legal shooting light, are also PRIMETIME for whitetails to show up.
One evening I was combing an edge of woods at last light with my Pentax binoculars and spotted 3 deer working their way into the field clearing. I saw them in the woods. I brought up my rifle which had the same scope you mention and barely.... and I mean barely could make them out. I didn't have enough light to make an ethical shot. I had under 10 minutes of legal light left and a scope with better % light transfer is what I needed that evening. I finally chose the Nikon Monarch 3-9x40 with an excellent 95% light transfer. I heard 97% is theoretically as high as it gets.
The Banner you speak of will work for daylight, but won't bring home the bacon in low light situations in my experience. I don't know considerations one should think about when coupling scopes with shotguns or muzzleloaders. My scope is on a rifle.
Snareman