You know, Jean Grey was never MEANT to die. The X-Men's editor at the time insisted Phoenix die for her actions as Dark Phoenix. This story, in a way, sets things right by bringing her back in a way much less contrived than many superhero resurrections. Far-fetched, yes, for the real world; but let's face it, these are comic book superheroes we're dealing with.
This collection features the (almost too) dramatic reunion of the original X-Men from X-Factor #1, as well as guest appearances by the Fantastic Four and Avengers. It sets up many more great moments later down the road (in X-Men: Inferno for instance), not to mention all the year of stories featuring Jean Grey since then. That alone makes me excited about it. A great follow-up to the Dark Phoenix Saga and From the Ashes.