Got those new babies.
Out of the box were a bit bass shy to my taste (the sub roll off has to be compensate a bit). Knowing well previous models, I removed the pads in order to shut two opposite vents with adhesive. Easy, no screw. Those inside vents are very effective to change the bass level. I small change goes a long way.
After that bass are good for me . Actually the fostex rp's doesn't have much subs (they do have a bit tho), but the bass is great. Layered, sustained, defined. Mids/trele are better than the t50 mk3 I have. More defined.
Then I tried balanced. First with my audio-gd he-9. Everything gets more precise, top to bottom. Then from my kann and same story: more precise, more punch. I often noticed that balanced amp goes well with planars, as if the softness of the planar let you enjoy more precision without being fatiguing.
With the kann I'm really happy, I was looking for a good outside alternative to my Audeze that doesn't make me cry. And I have to say I have a very good portable rig now. The balanced give me a bit of headroom which can be useful on some old tracks or in a noisy environment.
I would say it's fine out the box, but personally it still needs a bit of mods in order to really shine. After the inside vents tune think it needs lesting for more controlled sub and a bit acoustic absorbant inside the cup for tempering the cup resonance.
Confort wise it's better than before but the strap is still hard, so it can hurt a bit after few hours.