Well this weekend I'll be testing this hammock and I'm using a 3/4 phoenix 20 degree underquilt. I'm toying with the idea of also adding my 40 degree phoenix at the same time since it's supposed to be down to 16 and I'm a cold sleeper.
I was also a bit leery of the fabric, it's very thin; so much so you can see the ground through it. I think it'll be fine but I do think you have to be extra careful with something like this so you don't poke or tear it. I suspect that once it does have a tear that it would be all over
I think the key is with any ultralight gear is to treat it with care.