I've never had a Banner, but I've gotten to check out a few as several friends have them. Well, actually 2 friends have them, but each of them have several so I've gotten to check out several. One friend likes his and has no complaints, but most of his are older, and all he has is cheap Simmons, Tascos, and 2 older Redfields etc, to compare them to. I have checked them out, and while they seem halfway decent, the glass isn't very good and I don't see what he see's in them. Several of the Simmons I've used have had better glass, and he does say that he prefers Simmons. He has his on fairly hard kickers though and they have stood up, but at the same time he very rarely shoots them. He has one on a 12 gauge shotgun that he turkey hunts with that shoots 3.5" shells. I'm not sure if the POI shifted if you'd really see much of a difference on that or not since it's a 12-15" pattern. Then he has one on a .243, and 2 others on muzzle loaders.
Then my other friend has one on his 30-06 and on his muzzle loader. Both have held up for the couple of years he has had them, but the glass sucks. He is super cheap and refuses to spend anymore on something better, but there have been several times in the evenings where he has seen deer come out into the field and says he watched them with his naked eye, but couldn't see them through the scope, so he couldn't take a shot. He started to carry his shotgun with him to the stand as well so he could take shots at what he could see if they were close. I've looked through these and the glass is pretty pathetic on these too.
Neither of them have had them fail, but they both have pretty lousy glass imo. Online I've read of quite a few people having problems with them failing, but I can't comment on that. I do think I'd look for something else as I think you can probably get better glass for not much more.