I love the light weight and the pack-ability. It kept me very warm and comfortable during several wet camping trips. It breathes well. Purchase a quality pad to go along with this bag. It is puffy but does not provide much cushion compared to other materials. Do not attempt to zip or unzip this bag unless you are paying very close attention to what you are doing. The zippers snag very easily.
"Great bag for cooler temperatures, go with a full zip for warmer"
Used this bag on three trips totaling about 50 nights in summer, fall, and spring. Size regular for 5'11" 155 lb. male, fit great. Good materials and nice next to skin, light weight for a synthetic bag and compressed very small, 10x12 in. The bag excels in cold whether, used for a december trip in J-Tree and was warm down to the low 20s with a base layer and R2 fleece. The downfall of this bag is the half-zips, so anytime the temperature is above 50 my bottom half would sweat, then become freezing cold later on in the night when the perspiration evaporated. A one sided full zip would have made this bag much more versatile while sacrificing little to no weight.