Coming back from a recent business trip, my first with the T+A, I promised @angelom
an update. Unfortunately I must admit that I did run into a minor niggle with the T+A.
The good part is that I find the ANC (maximum setting) to be perfectly adequate. Not stellar and not at the level of Sony who typically keep the best versions of their technology to themselves. But absolutely fine for travel purposes. Low frequency engine hum is limited in quite a satisfactory manner. Also not unsurprisingly higher frequency sounds (voices and chatter) remain slightly audible.
My (only) issue however lies with the fact that ANC only works well when the earpads seal is intact. And although I am willing to accept that the shape of my head may partially have to do with this, I find the T+A to be slightly too sensitive to lateral or vertical head movements that occur while moving around, looking around, nodding or shaking my head as well as jaw movements when eating. The limiting effect on ANC performance was audible. More so than with the ML 5909.
In the end I managed to compensate it by being a bit more cautious in my head movements, but in my opinion noteworthy. This however may not necessarily happen to everyone. Since heads very in shape and size, I guess this is a typical case of YMMV