The C head is a very different concept, that looks similar, so be careful there. For starters, the C head holds only 10-15 solid uses. The Nature's Head and Airhead hold 40-60. So the c-head has to be emptied far more often, which is a huge disadvantage. Empty the c-head once a week, and the Nature's Head or Airhead every 4-6 weeks.
After 4-6 weeks, much of the earlier material is dried out and composted. However after a week, the c-head will simply be a bucket full of fresh poop mixed with peat moss. The Nature's Head and Airhead, with the composting process going on strong inside, quickly break down new additions of solid matter. Emptying the NH and Airhead will be far more pleasant and far less frequent.
The c-head uses disposable milk jugs to hold urine. They won't last long, and will need to be replaced. That might be ok if you are near civilizatiopn and drink milk. The others use a sturdy plastic bottle that will last forever.
The c-head in my view is pretty much a 'bucket with a seat' system. You remove fresh turds, not compost. It also looks cheaper, in my view. The c-head is not the same thing for less money. It's another concept entirely. For another $300 or $400, I'd get a better looking, more convenient proven toilet like the NH or AH.
I installed a C-Head in my motor home about four months ago, as a test run to see if it would be suitable for the boat I'm building. And it seems to me you're passing on some misinformation....
For starters, I empty my C-Head about once a month, not once a week. I get a lot more than 10 or 15 uses each time. And it most definitely isn't 'a bucket of fresh poop' I pull out. The C-Head is a desiccating toilet, which means the solids dry out rapidly. As you churn the contents after each use, you wind up with balls of material up to the size of a baseball, that mostly look and smell like plain old peat moss.
The C_Head is easy to empty, too. I just open the unit's lid, grab the bin's handle and pull it out. Then I take it outside, pop the lid off my accumulation bucket, and pour the stuff out of the container. Set it back in the toilet, add peat moss, and I'm good to go for about another month. It takes me less than five minutes, and there's none of this stuff about slipping plastic bags over the bin, then turning it upside down to empty it -- which sounds like a guaranteed recipe for a spill sooner or later, to me.
The gallon jugs work just fine. They're easier to handle than the two-gallon custom units used in the Air Head and Nature's Head -- and a whole lot cheaper. I replace them regularly anyway, so I'm not worried about how durable they are. And since I buy milk and water anyway, I have a never-ending supply of them....
If by 'looking cheap' you mean the C-Head doesn't look as fancy as the others, I suppose you're right. But it looks fine to me with its clean, simple lines. It also cost me a whole lot less; it takes up less room; it weighs less; it works fine; and I bought it so I could sit on it -- not so I could leave the door open and admire it between uses.
The hard part is going to be deciding whether to install this C-Head in my boat as planned when my build is complete, and reinstall the original toilet in my motor home, or keep this one where it is and spring for another one to install in the boat. Decisions, decisions.....
add: those 'sturdy plastic bottles' the others use last forever? Don't you believe it. I've read a couple of posts on other forums from people who said theirs started leaking, and they aren't cheap if you have to replace them -- or if you simply want a couple of spares for convenience.