Sorry, but who's the clown posting ads for his company??
Anyway, back to tents vs hammocks....
I had a Hennessey Hammock a few years ago, and absolutely loved it! The quickest thing you'll ever put up. And BRILLIANT in swampy areas!
I have used one a LOT. It's all I took when I backpacked/hiked (some serious jungle as well) in SE Asia. Pros:
If you're fast-hiking, these bad boys save you so much time!
Prior to all this new cuben fibre etc, there was no question a hammock was a really light, affordable way to go.
Even as a restless sleeper, I found I could get a very sound sleep in a hammock. It naturally wants you to sleep on your back, so you don't move around too much. (The downside is that I snore like a forest full of chainsaws sleeping on my back).
No poles to break. A well-made hammock won't break lines, and if you do, who cares? Everyone carries some paracord, right?
Cons: There's not always somewhere to tie off too. Of course, no dramas in the jungles of SE Asia, but I lived in the desert for awhile. Hammock is mostly useless in open spaces....
As mentioned, with even moderate air temperatures, your arse will get bloody cold very quickly! Hennessey came out with an insulating layer, and from what I hear they work really well, but haven't tried it. And of course, mucking around with that stuff adds both weight and set-up/pack-up time.
Bloody mosquitoes can still sting you through the hammock! Quite annoying, especially as I run hot and attract mosquitoes like nobody's business. I've got no idea if sandflies would still be able to bite you through it. I suspect not, but hey, I'm not staking my reputation on that....
It leaves your arse exposed. This may sound paranoia, especially to Kiwi's who don't have to deal with dodgy animals (although a boar's tusk in the arse wouldn't be pleasant). However, I was hiking in the Teman Negara jungle in Malaysia, and on my birthday, incidentally, I was all comfortably racked out in my hammock, when some torches from other campers (I was strung up between big cement poles underneath a hide) started to annoy me. I told them to piss off. They said seriously mate, a wild dog was about to bite a chunk out of your arse. Well, that changed my tune quick smart! I took my hammock upstairs and strung it from the rafters. No bloody animals were getting me up there! However, as a side-note, I got food poisoning that night, so was up and down all night vomiting violently. Yeah. Happy birthday Kreig....
So, my thoughts on hammocks: Brilliant in bushy areas without wild animals or loads of mosquitoes. Second to none. Also really good when visiting people where bedspace is at a premium. Normally somewhere inside/outside a house where you can string up. Totally crapola in wide open spaces, and good luck using it anywhere where an animal might have a nibble from below....!
Would I recommend it in NZ? I've been pondering that. I think they'd be great for hunters who are able to carry more gear. Because you'd need to insulate yourself well. Or if you're just camping, as opposed to tramping. If tramping, they'd be good in most parts of NZ in summer, but in winter, well, I'm dubious.
Would I recommend it for major thru-hikes like the TAT? Well, that's exactly what I'm starting to prepare for myself. And as a one-stop-shop shelter, I'd categorically say no. In alpine regions I reckon it would be completely inadequate, even if you can string up down lower in the tree-line.