If it was just a "how much am I drinking" smart cup, this would be in the same utterly ridiculous TMI category as all the other smart-[thing] junk like smart forks and whatnot.
However, the fact that it will apparently generate nutritional information for anything you put in it--including things that are not mass-produced--makes it a very, very cool bit of home nutritional science. (Assuming, of course, that it's accurate.)
Leaving health aside, just for the raw science of it, I'd be highly interested, for example, in what the actual caffeine content of the strong konacha that I have at dinner is compared to, say, kukicha or regular green tea. It's easy to find people saying how much caffeine green tea is supposed to have, after all, but that doesn't necessarily tell you anything realistic about how much is actually in that cup you just brewed.
Likewise, if I'm making my own smoothies or fruit or vegetable juice, knowing nutritionally what I've just mixed up would be at minimum interesting, and depending on how closely I watch my intake of various things could be quite valuable.
I'd almost buy one just for the chemical analysis fun of it.
I wonder how well it would work on homogenous soups... (if it does sodium, that could actually be pretty useful for homemade soup for people with high blood pressure).
