The PSP version of Persona is an wonderful 35~ hour experience for the PlayStation portable and the PlayStation Vita. My review is based of the SEBEC quest.
The best parts of the game are the plot and the features that have disappeared in the newer persona games. Those features being the negotiation system and how the actions you make have an impact further in the story. For example, depending on which characters you chose, the events will differ.
The fusion system is different but quite easy to get used to. The gameplay itswlf is a little outdated but still extremely addictive
Great game, try it if you can!