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Great quality. Most/all are convex so there is a wider view. Most of them are road legal - a result of viewing area. All this means nothing if they are mounted wrong.
Usually wrong width. Often wrong angles. I'm a big guy and have mine mounted an inch out (on wideners) Probably almost uniqe, but I can see straight behind me, have no blind spot (dead angle?) sideways and can see the mirror image without moving my head - just the eye balls. Very important in traffic. This formula is difficult, but worth it, I think.
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