Got my WBBB last week and had my first opportunity to try it out last night. I'm in Minnesota. It's been a warm winter/spring, so it only got down to 45 or so last night. I used a CF pad and was cold enough that I didn't sleep comfortably. I'm heading to the BWCA May 21, and it could get into the 30s at night, so I just ordered a Phoenix 3/4 UQ. Was hoping not to have to spend the money, but that's the way it goes!