I certainly enjoyed it, although the content's a bit ambitious for a short story. A mechanism for rebooting the universe? That really needs to be a novel, I think!
It was a good character piece for Dax, by which I mean the conjoined being in its entirety, not just Ezri Dax. A rather unique and imaginative way to play around in the joined Trill psyche. Certainly memorable. And some of the little scenes were quite striking. The Starfleet officer, Romulan and Cardassian playing cards for knowledge, power and survival respectively (I think), only for Ezri to kick it over.
It's also notable for being the first apperance of the Seleneans.