Shooting around corners with tactical mirrors

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A comment by a reader on a recent blog post brought my attention to picatinny rail-mountable mirrors that allow the user to shoot around corners without exposing themselves. These mirror kits work with 1x scopes such as EOTechs and Aimpoints.
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Diamondhead Versa-View Tactical Mirror Kit
X-Caliber Tactical Shieldshot Mirror Sight
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Have any of you tried these mirror sights?