I have an Arc'teryx Atom LT and really like it a lot. I also have a heavier synthetic, (Wild Things Hooded EP), that I like too as well as a couple of down jackets. The Core Loft Arc'teryx uses in the Atom LT is really good stuff. I chose the Atom LT over the Nano Puff, but they are fairly similar. Down is still the lightest and most compressible until it gets wet, but the synthetics are getting closer. From what I can tell, Montbell, Westcomb, Western Mountaineering, and Feathered Friends make the best down jackets, but several others are very good too.
Kent
