Too expensive to experiment with. If your friend has one and knows it's great why not borrow it and see for yourself. You might be able to give us some feedback on it.
To my knowledge the neurophone is for hearing through the skin and a deaf person may be able to hear using such a device. As such it seems to me that it would be just as effective as a paraliminal tape. For the price I'll stick to the paraliminals alone. Since I know they work it seems pointless to spend a fortune for something that may or may not work just as well. 
Alex
