I had a PPP that had problems; it kept going out of regeneration mode. PS Audio fixed it once for free. When it happened again I traded it in for a P5. WOW, what a difference, the P5 makes the PPP look like the cheaper Chinese product it is. The P5 is much heavier, more solidly built, and has been rock steady since I got it, with even lower distortion readings than the PPP. Bass is definitely better than with the PPP. Not a single issue at all.
If you have the choice, buy the P5. It's simply a much better unit.
If you have the choice, buy the P5. It's simply a much better unit.