as my Koss portapro just recently broke snapped, im looking into having it repaired soon.
i still have my Sony XB500, Grado SR80i, and my Sony ZX100 which someone else is using.
I bought my V6's because i needed a great sounding Closed Back can to tote around high school because my Grado's just arent great at isolation. as they are my strict "Home" phones now.
not only that, because i want good sound quality and a signature a little bit similar to Grados, but im always open to something new to hear.
and that, my XB500's have strong clamping force, i dont find them as comfortable as they really are, i love them. but the insane amount of bass played is fatiguing for me.
another reason i personally dont like the Beats line of headphones.