It could have it's uses
If range rules weren't load one-shoot one for trap singles, it would be nice to be able to load five at each station, then dump empties only as you rotated.
Like a pump or auto, the overall weight would change as you expelled shot, wads, and powder, but the changing moment arm on the magazine would be minimized by the rounds and empties being contained in the cylinder. They'd be close to the shooter's grip hand, and the weight distribution wouldn't change very dramatically from shot to shot like it would on a progressively empty tube magazine.
But overall, if reasonably made, I think the "Mateba" gee-whiz factor cited previously is still the greatest appeal here.