The mylar version IME has a decent balance stock though it is still on the warmer side & the highs are indeed a bit rolled off ( nothing as bad as the kapton version you guys are describing though).
I have been using mine with SRX-3 & now W11 pads which give it a treble boost.
The bass is very good on these, no flab at all & extends very low.
They indeed sound good enough to me that I haven't been tempted to upgrade from these.