Bought DT770 PRO 80 to see what will be the difference,
Let me tell you, there is definitely something is those carbon nanotubes used in S500/S600. They are steal for their price. Beyers are better, but not THAT MUCH better, plus, the bass does not reach as deep as on JVCs, DT770s are something between neutral and fun sounding HP's, so it's kinda hard to describe them. If you want a set of FUN sounding HPs, don't buy cans from $200 range, as these are mainly studio or neutral sounding with/out only a bit of salt. You are not paying for bass there, and certainly they are not intended for electro music, it sounds on DT770s only a little bit better, and as for portable usability, an E11 ($100) is needed.
Will be selling Beyers for something like $130, they look like new.
BTW, it's funny how S600 is $30
with a bit of boost (EQ) in midrange SQ makes you think that JVC accidentally put here drivers from some high-end HPs