i actually use these as my one-ski quiver. I also have dukes on them, and have taken them on 2k vert/6 mile+ tours... I love them. They aren't ideal to tour with (obviously), but you can make it happen. Super surfy feel in the pow, fairly decent in the crud considering their size and shape, and actually not bad on the groomers. Definitely takes a stronger skier to truly power them though, being that they're so large.
ps- i have mine mounted dead center