Got these today.
It's a RE262 upgrade for sure, very similar signature, midrange focused with soft treble and bass.
RE272 upgrade? I can't compare them side-by-side, but the RE272 impressed me quite more, despite taking issue with it's bass. At most it's a RE272 sidegrade. RE272 is clearer and more airy, even though it wont have the 400s "sweetness". Will compare them side-by-side to RE400 soon, will mod RE400 to match RE600 and compare as well.
They don't stand a chance to my BDD+NE or my modded 9927..
More details later.
Edited by Inks - 7/31/13 at 10:39pm