If you enjoy the Shin Megami Tensei series, or the original Persona 3, then this is definitely a game worth adding to your collection.
The PSP version of the game brings a wide range of new features, including the game from a new Female Main Character's perspective, new characters, new Social Links, and many other benefits. “The Answer” from FES is not included in this version, unfortunately, but all of the other FES extras are included in both sides – overall worth adding to your collection, even if you have either of the other versions. (I'd know, I own all three!)