Oh. I'm not a burn-in guy.
To me, the headphones i'm hunting for have to sound right out of the box.
For me, its all about brain adjustment.
The PM-3 is a nice compliment to my V30.
More prominent in the mid-lows and less in the mids than the Era.
Best to pair with a bright sounding source to lift the freqencies a bit.
As all planars, it benefits by adding more power to the bones. ^^
Sounds great on my R-28 with OS-8 mode.
But needs a perfect seal to shine.
With glasses on it loose a bit of its bass capabilities.
I use the PM-3 as a fun set mostly with my V30, which has more than enough power to drive it seriously.