You are absolutely right, Mike. This business of "mine is far superior to yours" IS silly. I heartily endorse the right of a purchaser to find his choice satisfactory, but must it be to the denigration of the alternatives? I am just happy there IS a good choice.
Indeed, a larger capacity would be quite worthwhile in some cases, maybe with a larger crew. Going a week or even a month between emptying the main container works fine for just the two of us, and dumping a gallon jug of pee in the next marina
toilet has less stink-potential than saving it for several days. I like that, but it's just me. By the same token, I didn't want a larger quantity of solid waste to deal with, when emptying the C-Head turned out to be so effortless. Very different needs, I think.
I agree that the AirHead/NaturesHead model has merits, and further submit that the C-Head also has merits, not entirely overlapping. To flatly claim with no evidence at all that the less expensive, smaller unit is somehow faulty or shoddy seems dishonorable.
"You're entitled to your own opinions, but not your own facts." Sen. Daniel P. Moynahan