Personally I like the composting toilet simplicity, but then I live alone so that would probably be simple and the most economical. However I don't plan on paying $1k for a composting throne.
Many years ago they were called composting outhouses, and worked very well at eliminating odors compared to a normal outhouse. It's interesting to see this used on a smaller scale in composting toilets, but my fascination doesn't go anywhere near the commercial price the composting portapotty's are selling for.
I'd say the commercial price is a good incentive to explore how to make this type of toilet. Yeah dumping could be kind of ugly, but so is a black tank for the unlucky person that gets that chore.