I have used a Hennessy hammock extensively while guiding wilderness canoe trips for the last few years. It has been a real back-saver for me after a day of paddling and had portaging. However, I do not use it for my western hunts for the following reasons;
1. Hammocks can be very cold to sleep in, you still need a pad or underquilt or the wind will freeze your bottom side.
2. There isn't really a weight savings; my complete hammock set-up is 3 1/2#, and my KUIU 2P tent is just over 3# and is quite adequate for two hunters and luxury for one.
3. There is NO room for your gear in a hammock, it all goes in dry bags under the hammock.
4. You need stout trees the proper distance apart to hang them.
5. Weather in the fall is much worse than in the summer and a lot of wind, rain, and cold can make a hammock very much a pain.
**Having said all that, I do love my hammock, just not for my backpack hunts.