Now that I've had the unit in use for a full year perhaps I can finish my review.
The Nature's Head works by separating liquids and solids. The liquids are very high in nitrogen. You can pour them into any toilet. (Or around trees.) The solids are dried. As they dry, the bacteria die off. All that is left is fiber. The solids can go into the landfill. Mine looked so innocuous that I used them as a soil amendment for a tree I was planting.
The head is very easy to use and maintain. Due to the way it's vented, I've never had any odor in the trailer. It still looks great, and I find it far preferable to having an extra chore of dumping my black tank.
You do need to sit down to use the head, not a problem for me. Though some men dislike that.
If there comes a day when I need to buy a new Lance, installation of a composting toilet such as a Nature's head will be my first mod without question.
My only ding is that the head is a bit large. The competing air head is smaller. I have a friend who installed an air head on his boat. We both agree that the Nature's Head seems to be better designed. Nature's Head has fewer moving parts to break and is generally sturdier.
As I posted elsewhere, it's April here in Alaska and I know we'll freeze up a few more times before summer. But I'm able to camp in my winterized trailer since my toilet doesn't use water. Since my trailer also serves as my power outage shelter; a dry toilet give far better functionality in those circumstances.
Should I ever find myself in need of a basement toilet in a conventional house, I'd opt for a Nature's Head before I installed standard toilet with an obnoxious macerating pump.