Tom L,
I have used a couple of different models and have found them to be much more comfortable than the ground. Go to hammmockforums.net and you will find any info on hammocks you will ever need. There are some very helpful members with alot more experience than I that can suggest several choices to pick from. Most UL hikers use a silicone coated ripstop nylon fabric. These are so much lighter than canvas or rope hammocks. I use a double layered fabric and place a closed cell foam pad between them to get more warmth as it reflects heat back to your body. Hope this will help you some.
kmat