It's digital capture squeezed into the same box with a Zink printer. Nothing wrong with that if it's what you want, but it's not a substitute for direct capture to film/print if the look-and-feel of the latter is what one is looking for.
(I wonder whether Fuji will ever integrate a digital camera with the Instax Share engine in the same way? Might confuse consumers, though.)
Two other things with Zink. First, I don't think we know much about the long-term stability of the Zink dyes (sure, Impossible fails that test, but Instax is quite good). And second, which may have implications for stability too, the prints are stickers - the dye crystals are coated on peelable adhesive paper. That's fine for a throw-away novelty product, maybe not so much if you want to keep the prints.