I recently got a chance to go hang with friends in OK. Grant brought a Ridge Creek UQ, and here are my first impressions:
It is crazy light for the size! It fits the RidgeRunner extremely well, and tucks perfectly under the saddle bags. There was near zero fiddle factor, as the UQ clipped in place and was done. (ok, I clipped it to the amsteel suspension, I should have clipped it to the webbing--USER ERROR) Anyway, I love that design! Simple, and effective.
So I hooked it up, and lay down in the RR. I immediately felt the warmth surround me. It was certainly too warm for the 65 degree day... So far so good!
That first night, I was plenty warm, but I didn't have the cinch cord tight enough at the southern end of the UQ, so I got a little CBS, but still slept fine. tightened it the second night and it was great!
I'm a notoriously cold sleeper, but was quite warm on the 40-ish degree nights.
All in all, based on my two nights, I'd say I really like this UQ. It's small, light, well designed and warm.
Now Grant is a human toaster, he indicated he slept down to 20 degrees, but YMMV.