Just dug out my original T1 after seeing how nigh on perfect they actually measure - it was my second flagship headphone after D7000, before I got HD800, and honestly, the T1 is still one of the best high end headphones I've heard. Especially if you give them a bit of a bass lift with EQ for the more "modern" genres I listen to, like industrial and metal, which is why I used to use it with an ALO Rx Mk3b with its bass boost.
Same here, just started giving the T1 gen.1 more head time recently. I fitted them with the ZMF leather perforated pads and I can't recommend them enough. It gave a nice uplift in the bass without being bloated and dialed down the treble just a touch, also a nice boost in comfort, when compared to the stock suede pads.
Coming back to them after spending time with other TOTL headphones, makes you appreciate how good the T1 really is and how people don't give it as much credit as it deserves.