At first look, the noise (real levels) will be the selling point, along with the speed. However, I agree that this could remain niche with the overall cost of travel remaining high into the foreseeable future, notwithstanding that some will always pay for this.
The two front motors look as if the rotors can be moved in an arc from vertical? They appear to be on a 90 degree angle fixture and the motors are horizontal, with all the others being vertical. On distance that would give them more speed?