So a couple months ago I had purchased a custom uq from Te-Wa. I had him make a Breeze out of Momentum50. Finally got it in yesterday and WOW, is it amazing!
40* rating, could be slightly lower because of the wind resistance of the momentum. Final weight, before cutting any of the shock cord down is 8.3 oz. I can say that I'm mightly pleased with that being a SUL backpacker.
Will put it to the test this weekend, lows should be mid-low 40's.