I've only had these boots for a few days in the backcountry so far. I'm very happy so far. They're the lightest 4-buckle boot in the world (lighter than the carbon). They're stiff enough for me (5'8", 147#, agressive skier), but if you're heavier or taller, you might want to go stiffer (ie Zzero 4 carbon or Zzeus). They're very comfortable for my feet. Match them with Dynafit bindings and agro skis and you'll be happy.
As far as touring performance goes, the tour mode seems fine to me. They don't tour like a 3-buckle boot, but also better than a heavy overlap boot. Backward cuff motion isn't an problem if you are skinning UP HILL.