No experience with it yet, but bought one. Field of view at 100 meters is 15.4 meters (50.6 feet at 109 yards) / 25' + at 54 ish yards / 12' + at 27 yards. I think that it is going to be perfect for me.
I'm up North so, yes it gets cold. The temp specs from the owner's manual: Operating temperature, °С / °F -25 to 50C / -13 to 122F. The Thermion 3 looks very nice indeed but are not available yet, just a pre-order today. I think that it is another $5-700 more. You can compare the two on the Pulsar website.