I love the design of the Dreamwalker sleeping bags. I have the 650 down bag and now the Syn 133 bag. The down bag is my winter bag and the Syn 133 is for spring summer fall bag. I recently tested the Syn 133 in the Eastern Sierras in Bridgeport, CA. With proper layering of clothing. I was able to stretch the comfort range into the low 30's, on an Exped Downmat Lite5 sleeping pad, no tent. Packing the sleeping bag into a Sea to Summit e-vent Sil compression dry stuff sack made for a very small and light package without any down feathers poking through the bag when compressed, like my Dreamwalker 650 down bag.
This review was written in the old system and had content requirements that are different than reviews written today.