I've made a couple of hammock socks and have used them. They add about 5-7 degrees inside the hammock shelter system. I also use a 3/8 ccf pad when it is below 50F. I'm working on an underquilt, but I'm not quite there yet. When I do, I'll be sure and post pic's.
If you think you can, you can. If you think you can't, you can't. Either way, you're right.