great bag, but beware
High quality product....it says to use it with rectangular mattress pads but it worked just fine with our Therma Rest Pro LIte Plus'. The temp didn't get below the mid 40's so I can't attest to the low end. However, we were plenty warm in the 40's - enough to have to unzip.
This bag is as good as everybody has stated below, but beware. My wife and I found out real fast that cuddling up is not necessarily a good thing when hoisting 40 lbs. packs all day. It sounds nice and romantic, but in reality it's pretty gross. Sometimes a little distance is a good thing when you haven't showered in a few days.....just our opinion.