I just picked up one of these and, although I haven't yet put it through its full paces, I'm pretty happy with it after one field test. I think it's going to be perfect for what I bought it for: to minimize discomfort on committing alpine-style ascents without significantly adding to the volume or weight I'm carrying.
I didn't buy it for fashion. I didn't buy it to keep toasty around a campfire on a chilly night, although it would do that fairly well too. And, I didn't buy it to ward off hypothermia when tent-bound at high altitude. I bought it so I'd have something clipped to my harness that I could put on to at least keep from visibly shivering while belaying.
This isn't the kind of down jacket that's going to immediately wrap you in warmth if you've been sitting around and have already hit that point of coldness that's hard to return from without a warm shower. It'd help but, for that, you (or, I, at least) need something that's more along the lines of a Mountain Hardwear Sub-Zero.
But, if your core is warm from a strenuous hike or climb, the down will quickly capture that heat and keep it while you're waiting for your 2nd to make his or her way up the climb. I intend to use it atop 2 or 3 layers including a soft shell. In that set up, I'd say it's temperature rating ranges from -10 to 30 degrees Fahrenheit. My metabolism is on the higher end and I run fairly warm so people who get cold easily may push the temp rating up 10 or so degrees.
It's weight and packability are great. If you're doing climbs that really require something lighter or smaller, you probably shouldn't be paying for your gear anyway.
I was really happy with the fit too. Often times, and frequently with European manufacturers, I have a hard time getting something that is long enough without having to size up. I'm 6'1"/175 lbs with a slightly long reach (35-ish inch arms). And, it fits great.
As far as the material goes, it is crazy light. It's hard to believe how warm it is when you're holding it in your hand. I can't yet speak to durability but it is a ripstop fabric. I'd agree with what someone else said about the appearance of the sheen and the silk screen logos. It looks too techy to wear out, IMO. But, given that choices must be made, I'll sacrifice appearance for performance.