Have any of you a) tried or b) know someone who has tried any of the supposed hearing enhancement devices advertized for cheap on many US TV stations lately, e.g. that "sonic hearing" device or Listen Up? If so, what have been the reviews of them? If you know someone who has tried these, were they DeafBlind? How were they able to use them being DeafBlind? How do they work compared to other much more expensive hearing aids? Are they worth the price?