Jack, I used a Hennessy Hammock for about 1400 miles on the AT last year and a Tarptent Virga on the LT this year. Here are my comments on each:
First off, the Hennessy Hammock is a great piece of gear. I am a back and side sleeper on the ground, but was almost always comfortable on my back in the hammock. I went thru several sleep systems trying different sleeping pads and shelters and still wasn’t satisfied with the comfort of my sleep until I picked up the Hennessy at Trail Days. After that I never missed sleeping on the ground. It’s great in the rain (actually better than a tent, IMHO), keeps bugs out, only weighs 2 lbs and packs small since it requires no poles. It’s a little difficult shifting around in it to change, but you get used to it.
You mentioned the swing option, but I almost never used it that way since the first thing I would do after setting it up is put my ridgerest and sleeping bag inside, making it pretty much impossible to use a swing.
I remember 2 nights when I was unable to find suitable trees and ended up setting it up on the ground, sort of like a bivy. This is fine for a night or two, but not ideal. I also still slept in shelters a few nights, mostly when I was just too beat or lazy to want to set anything up.
For the Long Trail this year, I was thinking ahead to the PCT, where the hammock may not be an option in some stretches. So I picked up a Tarptent and used it to try it out. I used a floorless model with a Tyvek ground cloth that I made. I figured that by using Tyvek, the Tarptent life isn’t dictated by how long the floor lasts - I can just get another piece.
Set up is a breeze, as Nooga described. It was great at keeping the bugs out. Setup in rain requires a little attention to the positioning of the groundcloth and mesh around the bottom of the Tarptent (maybe a drawback to not having a floor?). I got a little wet one night that I didn’t expect it to rain since I didn’t make sure the groundcloth lay inside the main silnylon body on both sides. A little water pooled on the Tyvek, no big deal really. I plan to trim the Tyvek a couple inches and sew on some velcro to the mesh with mating velcro on the Tyvek to keep them both in place. I was able to fit my 4000ci internal frame pack inside when necessary.
So the verdict? For me, I just love the Hennessy, so that would be my shelter of preference, but if I think finding suitable trees may be a problem, I’ll bring the Tarptent with no disappointment. They are both great, innovative products that have lots of followers for good reason.
I would recommend borrowing or buying a Hennessy to try it out for a few nights in your backyard or whatever. If you can sleep comfortably in it, then I bet you’ll be hooked. Otherwise, the Tarptent is a great option. Oh, and an alcohol stove is the way to go. Good luck!
Wedding Singer