I was a skeptic. I never imagined that lightweight "rando" boots would or could ever ski well. After last season this skeptic has become a believer! The Alien is an amazing little piece of technology. Of course it's crazy light, but it also skis really well, especially in nice spring corn snow, which was when I used it most. I took these out for most of April and May ski mountaineering in Colorado and loved them. Long days, steep couloirs, knife-ridges, it's like having a mountaineering boot that skis well.
I will say it took me a day or two to really dial in my technique with this boot- you have to be a bit careful about not over-flexing it- but once I found my perfect balance point it was game on. The cuff is amazingly supportive when your weight is back, like at the end of a fast turn. The BOA buckle system is brilliant, and the ski-walk mechanism is super easy to adjust and use.
I would recommend this boot to anyone who loves fitness touring or spring ski mountaineering. It's a game changer for me- light is right!