I finally got a chance to try out my new underquilt protector, and I was very pleased. Temps got down to 7* C (45F?) and the UQP really made a difference in holding in the warmth of my summer underquilt.
And I like the colour--it's exactly the same as my hammock. (Now I just need stealthier pack covers!)
Thanks 2Q & ZQ!
Here's a pic from my canoe trip in Algonquin.