Just took the XTherm out for an overnighter in PA. Snow was only 2-4 inches deep, night time temps around 15 degrees I think. Was toasty warm on the XTherm, and very comfortable. Nice pad.
Also had a chance to use my zPacks/TrailLite Designs cuben quilt liner. This thing rocks, truly. Kept any condensation away from my quilt. A winner.