Mike Rowe of Dirty Jobs fame filmed an episode where he helped to dismantle, clean and repair a malfunctioning unit similar to what you are describing above.The incenolet isn't like burning **** in a barrel. There is a small amount of odor in the exhaust according to those that have one, but per their website, "Waste is incinerated after each use - keeps bathroom free of odor and flies. Catalyst within the toilet keeps exhaust odor-free."
There are other types of incinerating toilets out there. This ain't your daddy's turd burner.
Basically, it uses a non-permeable paper to keep the trap door clean. You push a pedal down, which opens said trap doors. When it is activated, it sucks air across the pile of dookie/paper/etc while heating it from below at 1200* F via an element similar to those found on an electric stove. There is a catalyst inline with the exhaust that is designed to contain the odor, and the blower motor runs during the entire cycle.
Granted, this isn't better than a lot of of the ways out there (sewers, septic systems, etc), but for a boat, RV, bunker or similar shelter, it could be invaluable.
Poo soaked Arrows were the first biological warfare weapons if my History Channel education serves me right.