Spent 3 nights with lows getting into the 20's and the tri-layer walls worked awesome. Other RTT campers I was with had single wall tents and needed buddy gas heaters running all night and had huge condensation issues. I was perfectly fine with my layered walls and a small heating blanket in my sleeping bag. Condensation did build up, but not on the interior of the inner tent liner, so my bedding was never wet.
The liner does add a little bulk to the tent, so it's a little more difficult to close, but worth the trouble.