I bought this bag 2 weeks ago and have used it on two separate trips already. I think I have the earlier model, but it looks like nothing has changed except the color. This bag is extremely toasty! I had a zero degree sythetic before this and the insulation was paper thin! On my first outing temps were about 20-25 degrees to start out the night and I was too hot! I had half my body hanging out and was only wearing a t shirt. As it cooled down I was able to put the rest of my body in the bag and by morning I was able to zip the bag up. Temps probably got down to zero degrees and I was toasty warm. On my second outing it was a little colder and I was more comfortable. Temps probably got down to -5 or so. I zipped it up all the way and was toaty warm all night in only a t shirt. This bag packs well compared to my synthetic. It takes a while to poof up so just be patient. Little to absolutely no down has leaked thus far. As long as I take good care of this bag I anticipate on using this bag for year and years! The waterproof membarane seems to work, althought I havent really tested it. Drips bead up and roll off quite well. Bottom line: great bag, spendy but will eventually pay for itself.