I have p3's to my Melody SET integrated and Esoteric K-03 in my office system and they sound great. The Melody pulls about 350w at idle, according to the P-10 I have on it.
We were reconfiguring my home system today, taking out an SR Powercell and installing two PS Audio p-10's - i per amp/side. With PS Audio AC12's coming out of the wall to the P-10's, the sound was OK, but not quite as good as it was before the changes. To be expected, since all cables and the P-10s had no hours on them.
As an experiment, I replaced the SR Hologram-D pc that was on my APL NWO-M CD/SACD player, with a P-3 cable I had, also cold. The change was immediate and like night and day. Detail, imaging, soundstage, EVERYTHING came back, but even better than before. We were shocked. I will be replacing the AC-12s with P-3s and the P-3 on the CD player with a P-4. I'm pretty sure there are more P-4s that will find their way into my home system as existing cabling gets broken in and budget allows..