I use a pair of Free Ventures and I think they're great. But they are not really made for downhill skiing - they are more of a snowshoe/ski mutant hybrid - if that makes any sense. I was out last week and played with my snowshoes and Free Ventures for the day. The Free Ventures are great for belting along on level ground and not too steeply sloping ground, but mountaineering boots and the bindings on the skis just don't hack it for belting downhill. Annoyingly, the Free Ventures don't fit a lot of mountaineering boots, like my Pro - Thermics, but they do fit my Mantas. The Mantas are too flexible to get the best out of the skis though. Compromise, compromise.
One thing I've noticed is that they are less tiring than snowshoes.
Dunno if any of that helps.