I got my traveler sock in a few days ago and had a chance to try it. I enjoyed 2 and a half solid hours at 28* with a 30* UQ and a 40* TQ. The reason for the short period of time was two-fold, 1) CBS, I'm a newb, and couldn't get the UQ right that night. 2) Traffic, I live next to a highway. Very happy with my sock. And yes, condensation, deal with it.
My question is this, has anyone tried using a sock during the summer instead of blankets and UQ? Maybe double the door, put a no-see-um door on the outside for ventilation options. I'm thinking experimentation is in order this coming year.