This is a great bag. Super light and warm. I have found that sleeping bags are always too hot to sleep comfortably even venting with the zipper, it can be really hard to dial into a comfy temp. This bag has the widest temperature range I have ever seen with a bag. I have found it comfortable from 60 to 20 degrees. If you only want to buy one bag this is a good choice for all but full on winter camping. I usually sleep warm but froze in this thing at 10-15 degrees (I know it is below its rating). I prefer the pinnacle bag because I found it comfortable at 5 degrees and could have gone well past zero. The pinnacle bag has a better, warmer foot box, a draft collar and a better hood but the same loft through the torso. The foot box, draft collar and hood add some weight but make a BIG difference when it gets in the single digits. I did find the helium to breath better.