Thermacells sound great but they don't work well at all at high elevations, I can't even get mine to work in town at 6,000 feet let alone at 10,000-12,000 where I hunt. I don't know why the even sell them in WY.
They say on their website that they are unreliable above 4500 feet.
http://www.mosquitorepellent.com/faq.asp#18
Sorry to get off topic, I think the hammock is worth a try. I went on a backpacking trip with a guy that used one it looked like a pretty good setup but sometimes I camp above treeline so in that case it wouldn't workout.