They come with a built-in 32-band hearing test and adapt to its results to (allegedly) let you hear the full audio spectrum in both ears.
I'm not really considering ordering them myself, but I wonder if these could be interesting for studio use. They're wireless (using Bluetooth) but also have a 3.5mm jack and it looks like the active noise cancellation can be turned off. The scientific/medical background of the developers makes me think they're aiming at a neutral reproduction ("hear the music as it was produced") rather than creating a colored, "musical" profile -- there's no mention of things like "warm" sound. On the other hand, not much is said about the actual speakers used either, except that they're 32 Ohm -- not super high.