I like the HHSS, and have had it down to around 30 but I had an UQ inside of it. I was toasty warm and I also had the OC and it kept the heat in. I have the old system that has to be put on when you are setting up. It cannot be put on once you are setup. I would like the new system better. I would like an UC that doesn't have the slit in it since I have the zip model Explorer UL. I hate the slit in the bottom of the UC, it is a pain and I think it would be warmer without the slit. Just my $.02.
Also, I experienced no condensation.