Welcome to the OPPO club Grant. I've been using them for a couple of years now and will not be moving them on anytime soon.
For downstairs use I use the PM1's and for bedroom and travel the PM3's are truly excellent, something you now know about.
Having just returned from a long haul trip involving 2 loads of 12 hrs in a plane the PM3's other advantage is that they keep a lot of the jet noise away from my delicate little ears.
I would also recommend upgrading the standard cable to Atlas Zeno for the PM3's, a worthwhile purchase. Tried a set of Zeno's on the PM1's but couldn't hear much difference but I needed the extra length so I've kept them.
Sadly I have now heard that OPPO are discontinuing selling headphones. So anybody who can get there hands on a pair ex dem or something will find that they won't be disappointed.
SOURCE:OPPO UDP-205 BluRay, SkyQ, Technics SL1210M5G/HexMat Eclipse/MN Bearing/Origin Live Gravity One puck/Isonoes with Boots/Jelco TK-850S Tonearm/Hana Umami Blue, PS Audio Stellar Phonostage. I also have an AT-OC9XSH as a spare cartridge.
AMPLIFIER: Bryston BR-20 Pre/DAC/Streamer & Bryston 4B3 Power Amplifier
SPEAKERS: Spendor D7 on Iso-Acoustics Gaia III’s
HEADPHONES: OPPO PM-1 with Atlas Zeno cable, B&W Pi7 S2 and B&W C5 v2.
CABLES: Analogue: Speaker Atlas Mavros Grun. Interconnect - Atlas Mavros XLR x3, MCRU Silver Tonearm cable
Digital:Audioquest Carbon Ethernet x 4, Audioquest Carbon digital, English Electric 8Switch, Chord Optichord, Atlas Optical.
Mains: PS Audio Perfectwave AC-05 x 5, Isol-8 Powerline Extreme with Quantum Science yellow fuse on input cable, Sounds Fantastic 6way Mains Blocks.
STORAGE: Synology DS216J NAS with 2 x 3Tb WD Red hard-drives. Samsung 500Gb SSD.
TV LG55B7 OLED