Hey Ben, Thanks for the support. Its really much appreciated. Especially as I'm trying to figure out how I to use my skills and experience - in researching and writing about commercial design and innovation - to get a job that Does Good (any advice/words of wisdom would be extremely appreciated).
Back to Tandem; as I wrote the post, I did ask a few neighbouring gentlemen whether they would use it and they think the idea is genius.
I know this kind of design for conventional S/U/J/P toilets, already exists in some Japanese residential homes. So I guess its taking off there. One difference, is that the water from the tap automatically runs when the toilet is (first) flushed, and therefore it doesn't have the water saving feature.