Bought it with a Topping DX3 Pro+, really nice combo.
My first planar, heard great things about it, expected great bass, but when I tried it stock, it was meh.. overall better than my K7XX, but lowend was nowhere.
Then I applied an Oratory PEQ and added the linear subbass extension & ~10db extra for the bass shelf, and wow.. there it was!
Very nice clean bass, much better low extension than my K7XX
(Note that I have an overall negative gain to compensate for the bass, so I sacrifice some max volume for better bass, but im nowhere near maxing the amp, so its fine.)
So sound is great, bass iw awesome, also very comfortable, love it.
Cannot think of anything bad to say, would buy it again.