Nicholas V.wrote a review of Sierra Designs Cal 30 800-Fill DriDown Sleeping Bag: 30 Degree Down on September 18, 2013
Familiarity: I've used it several times
Dew dried quickly on this bag over two one-week long adventures. Lofty and warm all week. Crazy light. Warmer than expected for a 30 degree bag and comfortable at 40 with a bag liner and no clothes.
Zipper seemed like a 1/3 zip bag (even if it is actually closer to 1/2 zip), which is the primary drawback for me. In 50+ weather, you can't unzip completely to use the bag as a blanket or fully vent so you are left a bit too hot. Fairly narrow lower leg section, which might constrict some side sleepers. Zipper catches often but that is not unexpected in the ultralight world of bags. I would trade a couple ounces for a full zip and the associated versatility and rate this bag 5 stars.