I don't know of anyone here except for BowTechShooter and possibly Pdq (Phil) who has shot the Justice.
I suspect all the hoopla is about the Liberty because it's a bit of a better performer and (by todays standards) is more mid length in axle to axle. Shorter bows while still very popular, seem to be taking a backseat to the slightly longer models in the past year or so.
From what I've heard it's every bit as nice as the Liberty shooting wise. For those folks who value a very compact bow, and are not concerned with all out speed, it's probably a good choice. I am considering one myself now as Santa Claus (read: the mrs.) says I've been extra good this year