Tried The HH SS a few times now and really like it. It has been mostly nice summer nights but with chilly winds and in mountains though. No idea what the temp were, I suspect around 10-12C, and it was perfect just with the UC and foam pad.
I plan to use it in winter and I am a bit nervous when I compare it to these big fluffy UQ ;-)
My only -big- disappointment is that the UC is made to fit bottom entry HH, so you have that big stupid oddly closed slit instead of a perfect cocoon... I really think HH should make 2 different models.
this is why you have 2q and zq make it a top entry and fix the bottom. i had my hammock modded by them and it makes it so much better. i would suggest a mod