The sound does not leak as much anymore compared to the last generation

The noise cancelling does produce a slight background noise when in idle, so don't be surprised when you hear something along the lines of mild static

The headphones do feel a little warm after prolonged use, but does not become unbearable

right ear does not work.

Style does not trump sound quality, build quality or durability

The hissing does not go away when playing music, it just detracts from the sound quality of the headphones

Expensive does not mean quality.