Johnathan Phillips Rogers wrote a review of Arc'teryx Cerium LT Down Jacket - Men's on February 4, 2014
Familiarity: I've used it once or twice and have initial impressions
Fit: True to size
I received this along with a Patti Ultralight Down and the Cerium is considerably warmer but equally light. The Cerium's fit is slightly more athletic- trimmer waist, higher armpits, slightly longer as well. But what is most surprising is the warmth to weight ratio. The Cerium with a t-shirt should be toasty in the 20s. Today it was only in the high 30s so I didn't really get to test it but just slipping it on outside gave a clear indication of its warmth. For the weight I can't imagine anything else packs this punch. I wouldn't describe the fabric as rugged but it doesn't seem flimsy. I'm sure a more hardcore backcountry enthusiast will give feedback on this aspect of the jacket. If maximum warmth and minimum weight is your aim, this is the bull's eye.