Had one on a shotgun years ago just because I wanted to try it. It worked fine and I did shoot pretty well with it. I would say it does compensate for an off centre pattern.
BUT the old shotgunner in me said bye bye to it mainly because of the aiming thing. You aren't meant to aim a shotty.
My only defence is I am left eye dominant and it works well with that. It is also a an OEG type so you cant see through it with the right eye and this also suits my left eye thing
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