I hardly ever post but when i do i try to help:
I have had experience with the Hennessey backpacker asym and the clark jungle hammock north America model.
I like both and they both have a place in my gear closet.
The Hennessey is a bit easier to set up and lighter as well as a smaller package to carry. However, it is more time consuming to get in and out of, there is room for gear inside but you'll be knocking it around a bit. Cold weather camping is possible if you use a closed cell foam mat or get the cold weather kit from Hennessey. Being lighter and smaller in bulk it sees overnight and weekend trips summer and early fall. Construction is top notch and has taken some abuse without a scar.
Having said that about the Hennessey, lets talk about the Clark jungle hammock.
The clark takes a bit of finesse to set up and it is a few .oz heavier and bulkier (packed for hiking)than the Hennessey, but IMHO it is a YEAR ROUND SHELTER. I did say you could use a closed cell foam pad with the hennessey or even buy the cold weather kit, but, if you just throw some gear in the bottom pockets in the clark, and possibly a thin cell pad you can camp down to the teens in the clark, i have. The clark also has access from both sides(read: you can lean out one side and cook while you are setting the hook on a stream trout out the other side), a built in weather shield(read: You are half asleep, you messed up the rainfly setup and it just started blowing and pouring, just reach down and zip in a wind proof, water resistant, security blanket and tadah! back to sleep), lounge chair setup is a breeze(read: unzip either side and plop yer butt down). The clark also sets up as a tent easily(to be fair the hennessey does this too), two hiking poles some pegs and thats it you have a one+ person (2 if you really had to) shelter that is easily accessible from both sides(you have to wiggle into the hennessey).
Gotta run for now, but ill try to get back to this post and elaborate further on both models.
P.S.
I highly recommend the sgt. Rock site(above post somewhere), it is a good read with lots of pictures and more details.
www.junglehammock.com is the site for the clark hammocks.
http://www.hennessyhammock.com/ is the site for the hennessey line of hammocks.
I hope this helps for now and good luck.
Gonzzo.