With grandiose claims like that, that thing better have a very lenient return policy (90 days or more), so if people don't feel the nervana, they can send that little device nervana'ing back to its warehouse. Offering such a flashy, innovative product together with such sensational claims without letting a buyer actually try it for himself would be very weird indeed.
Moreover, like Scary Sheep said, if tried, it should be used without any music whatsoever for testing purposes (initially at least). High fidelity music alone would make anyone feel good, so that would completely ruin any type of efficacy test relating to stimulation.