Hi Katie,
I am a hammock camper. Lot’s of info on Hammock Forums if you are interested in more cottage vendors, reviews, experience, and a good for sale subforum.
This is not a new idea. There are vendors making integrated insulation hammocks, but they are not the mainstream solution. More typical is a separate hammock and underquilt. Realize, of course, that you need a top quilt too. To translate this to non-hammock BPL crowd, the hammock, suspension and tarp replace your shelter. The underquilt replaces your sleeping pad – not for softness, but for warmth. You really need bottom insulation below ~70F and a down underquilt is the cat’s meow. You can use a sleeping pad, but it’s not as comfortable, or a synthetic underquilt that is typically less compressible.
My netless hammocks weigh ~11, but I usually use one with an integrated bug net at 15 to 22 oz, with a few more oz for the suspension. My partial length down underquilt will weigh ~15 oz and my full length down underquilt weighs 22 oz (both rated 20F). So in that regard it is not the lightest, but comparable. Tarps and top quilts are of course more, and needed if you are going to rely on this for shelter and nighttime warmth.
One more thing I’ll comment on. The wide range is pretty accurate. I use my 20F underquilts and typically a 30F top quilt all the way up to 70F nighttime temps. You can use less insulation, but the extra insulation under you does not cause you to overheat. Top quilts you can vent or with temps above 6, just use a jacket or fleece blanket. For backpacking I’ll always bring the topquilt.
So should you buy an integrated hammock and underquilt? It’s not a bad idea, unless you want to jump in soaking wet. You would treat it just like what you would sleep on in a tent, and if you are used to down sleeping bags you would try to keep it dry. Integrated underquilts are probably less fiddly, but modular means to you can taylor the equipment for the trip. I like the partial underquilt for backpacking (saves me 6 oz), but I always use the full underquilt for car camps.
I hope that helps. BTW…with practice the hammock is not fidgety. I find I have to adjust my tarptent Notch a lot more than I do my hammock setup. As long as you have trees, you don’t even really need a flat spot, which opens up a lot more campsites.
