Not sure I can add anything that hasn't already been provided other than our experience. We picked up our Northstar TC 800 in Ohio in January and while driving back to NC we decided to camp in KY in the Daniel Boone National Forest at one of the campgrounds. This was brand new to us as we've never had a TC. We had already bought flannel sheets and a good comforter and brought along 0 degree sleeping bags just in case. The temps that night hovered in the single digits and when we woke it was 5 degrees. The propane heater kept the TC pretty toasty but we seemed to go from too hot to a little too cold. It seemed that the bi-metallic coil thermometer didn't regulate the heat well enough, probably a 5-8 degree swing. We replaced that with a Honeywell electronic thermometer and that made a huge difference as the heat was moderated to about a 1 degree swing and a more consistent and comfortable environment. We don'y have the winterized version but seemed to be ok with us. What we really liked about our winter camping was the lack of other folks around. Whether boondocking or staying at a state park/national park campground, we were generally the only ones there and free to let the dogs explore a little more freely than if the place was loaded with campers. The ranger at one campground while patrolling saw me with our two hounds off leash and just nodded, knowing that they were under control and respectful that there were no guests other than one 5th wheel on site. Wouldn't be the case in spring/summer season. Looking forward to our next trip as we are headed to UT for a few weeks for some hiking, mtn biking and general exploring.