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I just bought a pair of the murdered black on black ones. they're sick. they are spherical as you have mentioned, not sure about lens quality yet, but seems legit. would recommend. i had never heard of them until browsing smith site, glad i got them now
I'm on my second season with my Vice's. More than satisfied. It IS a spherical lens. My lenses have held up great, with no major scratches. Lenses change out in about a minute. I would definitely recommend.