Like all things German, the Beyerdynamic T1 headphones, now in second iteration, are built to last… sound-wise, it's a matter of how you like your sonic seasoning.
The new T1 now evens out the sonic inconsistencies of its predecessor; Where v1 did some things well and others not, the new kid does a consistent job; Presentation is confident, there's an overall sense of tonal balance and nuance, accuracy is spot on with a slight hint of musicality.
Treble may seem slightly sharp on certain tracks; I would've liked this tempered just ever so slightly; The semi-open design is a conscious decision by the company; As a preference, I gravitated to the T90 for the open-back airiness