Composting toilets way of the future?

[Joseph Weisenbloom]

I was watching that Bill Gates documentary and he was talking about the toilet of the future and how he is funding competitions for university students to design it. It seems like the modern toilet is wasteful of water and expensive to hook up to sewer. Anyone ever use a composting toilet in their personal home or dare I say in a rental? What brand of composting toilet did you use? From some brief research it seems like its a promising area but not sure the technology is there yet to match the ease of use of a standard toilet.