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Blister have produced reviews on the shiro, I'd definitely take a look at their reviews -below. There's also quality discussion about the Gotama on TGR, so I'd go consult that too.
blistergearreview.com/gear-reviews/2012-2013-volkl-shiro
blistergearreview.com/gear.../2nd-look-2012-2013-volkl-shiro
Good call if you've already got a ski to use for hard snow a pow ski would be a nice addition to the quiver