I've read lots of posts like, "it shifted off to one side at 3AM," or, "I use a pad for my feet," or "I had to fiddle with it to..."
Many people have to adjust the covers while sleeping in a hotel as well.
Doesn't it make sense that if you drop a couple-three hunski on a hammock, it shouldn't be a search for something so primary to the use of the product as keeping warm in temps below 70F?
The hammocks without integrated insulation tend to range from 20-200 bucks.
Think how well the topside is covered with well integrated insect sceens and tarps.
The tarps normally are not integrated and that still does not provide any insulation, nor does a tent.
The current crop of UQ's may be of excellent quality, but they are tacked on and not what I would call modular design. Imagine getting a nice digital SLR and ordering up a lens that might fit, and it might work in the conditions you have in mind, and it is held on with bungee cords. Please.
Imagine having a Canon DSLR and not being able to use a Nikor lense. In essence, a proprietary attachment system would accomplish just that.
And the idea that you can use a standard 20" hiking pad is laughable. They are uncomfortable and don't give effective coverage.
Pads go up to 40" wide.