New owner of 1st gen T1 reporting in 

Tested both T1.1 and T1.2, at the end tapao the T1.1 

Coming from Audio Technical AD1000X, below is my opinion.

TL'DR, T1.2 has louder sound presentation, ear piercing. T1.1 is smoother , flatter signature.

Long version:
If you compare both cans side by side with same amp/song, you will immediately notice T1.2 has louder sound. However, seems like it is trying to bring up all the available sounds, you will have hard time hearing the instrument separation. The vocal is much more heavier/darker/stronger albeit a little bit synthetically, ear-piercing to me. Feel fatigue after ~1 hour of music, too much sounds pushing toward me.

For T1.1, overall is flatter but very natural sounds. Since there is no over emphasis on any particular sounds, you should be no problem hearing instrumental separation. Can hear for long period of time, vocal is a bit too soft, as compared to my AD1000X which the vocal is basically sugar-coated. Since i prefer a more relaxing can, i went for T1.1    If i want a more engaging can, can always go back to my AD1000x.

Currently using Xonar Essence STX mod LM49720HA opamp, not the perfect match for T1 but for the price/performance ratio has no complain. 

Jaben selling T1.2 at Rm5299-20% = RM4284 
I tried many FLAC/WAV/APE songs, the biggest bottleneck now is not really DAC/AMP but the song recording quality itself. If they recompose old song quality with newer format, mostly are still quite bad...   Newer song with new instruments are mostly shine with my setup

T1 does require good power amp, however the matching signature is much easier comparing with a lot of headphones, may i know what amplifier are you using right now?

Official BeyerdynamicMY? 

How about Beyerdynamic A20 or A2?       

should try the AKT1p.  at only 32ohms, it actually sounds better than the T1.2 

Spending some time letting this Xelento settle, so far sounds promising