I like T1 V2 for overall competence in sound presentation. Solid build and comfort. There are better headphones in particular areas but these others are not that good all-rounders as T1 are.
 
I do listem many genres of music (I love movie scores, acoustic music, hard rock) but symfonic music is where T1 shines. The dynamics and layering is just great. You will never be bored with classical music on T1. The details, linearity, clear view for the sound is just amazing. I was looking for such a headphones for 2 years, hearing many others. And only few I was considering seriously were HE6, but I did choose solid german tradition in this matter. Beyerdynamic does not produce perfect headphones, but the headphones with less possible faults possible, while many other headphones did have lot of faults... In sonic reproduction and also in build. So the decision was basing on sound, and overall quality approach and durability of product ( I don't know why in US there is a lot of driver mismatches and so problems with Beyedynamic headphones...)
 
There is opinion that T1 V1 sound good with OTL amps. IT could be. But I did not find the OTL sound pleasing to me (in my particular experience) and the Solid State in my case was much better sounding. But what I want to say is: don't be afraid to check T1 V2 with SS amps. You may be surprised.
 
Are the T1 V2 bright as many people say about T1 line? Well, I'd say these are 'well lightened' in sound. The smoothness of heights and mids does not make them harsh, or strident (like for example TH900/600 are to me) V2 is a bit different from V1. How much? It is hard to describe. But I know people, like me, who didn't like V1 that much to buy it while V2 are in my possesion.
 
These are absolutelty worth to audition in our flooded heapphones market. These grow up with time in your audio chain, but are not for everyone. These are not great for example for modern pop and music like Justin Bieber or 'digital trash' rock. As such music is far away from good dynamics and nuances and 3-dimensonality (while in contradictory Daft Pank sounds perfect with them). Clou: the better the music the better the sound with T1.
 
Here's the list of headphones I was considering as final group during the research (audiotioned)
First position is best liked and the last less liked (my totally subjective likings):
 
T1 V2
 
HE6
Ultrasone Edition 5
Pandora Sonorous VII
LCD3
HE1000
LCD2
HD800
HE500
HE560
T90
TH900
LCD XC/X
AQ Night Hawk
TH600
HE400i
ATH-R70x
HD600
...

I just like these headphones so much. I was looking for for a long a realixing but engaging headphones. And finally found DT150. Sound is full, present, clear, and with perfect 3D presentation - even better than in some opened constructions. I prefere them more than Senn HD650, HifiMan HE500, Beyerdynamic DT990, DT880, T70, T90, T1 even for now...

Very nice amplifier. Very solid build. Love vocal presentation and rich lower mids. Helps to achieve warm signature with technical headphones like T70 (even with such effective headphones there is no hum..). Perfect partner for HD650. Works good with K701. 3 pairs of inputs make it very versatile machine. Price is rather attractive (about 160 Euro) for the unit made and designed in EU - bergain. Equipped with 4 x SOVTEK tubes.

I will not write a long description, but just some subjective facts. 
I like them very much. I do have HD650 also, but when I want to be closer to music and see more truth in recordings I use T70. Lately they are my favourite headphones. Since about half a year. With good source the bass i sufficient and very precise, in fact very warm. Some phones may sound more relaxing but with the cost of losing  too many details. Here detailing is brillant. They are exceptional. But rather kind of love or hate headphones. Better for accoustic, jazz, orchestra than for rock and pop.

I did buy this amp to see if it really can beat expensive amps. Well, it plays nice, but does not even play like 300$ amps. Nice to have as an experience, but not as a final word in system.