I have a P12 and P15. Used a P12 for years and was extremely satisfied. 2 big Parasound amps and all sources without a problem…until, I have started listening to more Dolby Atmos music and Pearl Jam Vitalogy shut down the P12. So cue the P15, installed it with amps and most sources. I use the P12 for Roku and tv. I did notice an inmprovement in sound quality across the board. With the P15 the system became more relaxed, refined, and plenty of headroom. P15 does not shut down and will hit 105db peaks with ease.
Not sure what you can buy a P12 for now, butbif they are reasonbly close in cost I definitely would snag a P15 before sold out. It is a large piece, so make sure you have the room.
Good luck!