Oh I will definitely post my impressions of the pads.
The difference from the stiff craft felt on the back of the drivers is a good one as well. It definitely made them quicker, more detailed, and more up-front sounding. Before this mod I was always tempted to crank the volume up higher. Now they definitely sound more lively and I no longer have the constant desire to turn the volume up higher. Maybe with the alpha pads I'll finally like them as much, or maybe more than my Q701. Right now it's already pretty close, but a bigger, wider soundstage may seal the deal.
Of course these don't sound anything like the Q701, please don't anybody take that last paragraph as me saying they sound the same. I have just always, so far prefered the Q701 over these modded T50rp's. These are sounding better all the time and are growing on me now though.
Yeah, I've seen a lot of positive reviews about them (isolation, soundstage, and imaging). I'm definitely interested in getting some, I'm not too concerned with the FR on the high end anyway, it's not like there's ever been a headphone that ISN'T sawtoothed up top. You should definitely comment on your findings with the pads