I'm not sure I understand. Aren't most emoji included in Unicode? I mean, they're sort of black and white and poor, but they're there. What does this add other than a new library of graphics that needs to be supported and may or may not be better than the ones we see on iPhone or Android?
I guess some are missing from the Unicode set. But I'm not sure I like the art style on this one, so I wouldn't choose it either.