My T50RP arrived 2 days ago, (order inspired by Magicman's 40 hr mod session) they didn't seem as bad out of the box as I feared - got some idea of how they could sound by cupping my hands around the cups and applying pressure.
I took them home that evening and, after staring at them for a while, decided to take them apart.
I loaded the baffle etc. with modelling clay, sealed most of the vent grill, stuck some foam in the cups, put in some fluffed cotton balls - and I'd had enough (tweak energy dissipated in an hour) - screwed them back together and fitted 840 pads.
I might only be half way to max sound-wise (or maybe I got lucky) but damn they sound good, spent the rest of the evening until late listening to music with them.
I took them back into work the next day, a teenage Beats fan had a listen and "Oh,wow" was his wide-eyed response.
I'd like to thank all T50 mod contributors for leading me to this (maybe I'll try harder one day).
And, I loved them from X3 as USB DAC.
Edit: I bought mine from eGlobal
if you're in USA maybe you can get better prices, these were by far the cheapest to get sent to Australia.