Compressibility
The Lynx uses high quality 850+ down and a micro fiber shell that I found to compress very well, especially considering it holds so much down.  The Lynx easily compresses into a medium sized compression sack, but the Lynx with the Gore-Tex shell would not compress as well due to the heavier and less compressible materials.   

Warmth
The Lynx had one of the warmest manufacturers ratings this category and held true to its rating.  The 850+ down held body heat very well. The hood is wrapped in down and has good options for adjusting the fit to find just the right feel. The snag free zipper was easy to operate and it allowed me to adjust the temperature inside the bag in accordance with the outside temperatures.  I found this bag comfortable in temperatures from 0 to 10 F and only got cold on a very windy night with a temperature of -2 F at 19,000 feet.  The Lynx is the warmest bag in this category.  

Overall Comfort
The Lynx provides a roomy feel without having extra wasted space, making it very comfortable.  Pair this with super high loft down, a zipper that never snags and a comfortable headpiece and collar, the Lynx was one of the most comfortable bags in this category.  

Durability
The Western Mountaineering Lynx proved tough and durable even after weeks of serious use.  The zipper performed flawlessly and the shell handled tent condensation, rain and snow well.  

Features
The Western Mountaineering Lynx provides two shell options, one using light-weight Micro Fiber and the other Gore Windstopper. The Lynx features Western Mountaineering’s popular zipper system that uses the widest stiffening tape compared to any other bag I have tested. This results in a zipper that never snags.  The Lynx has overfill options to add 4.5 ounces of down in the bag or 1.5 ounces of down in the foot box for an added cost.  Western Mountaineering uses a reverse differential hood design, which means the hood is cut so the inside of the hood is made with a larger piece of fabric than the outside.  This feature provides a comfortable, warm, billowy pillow around your head without having to cinch the hood tight.  I wish the Lynx came with a small pocket inside the bag to store camera batteries and other items.