I am going to a local foodie meet-up/dinner in a couple weeks, and the host has procured some of these berries for the event. We're going to have a "Taste Tripping" session after dinner, in which we'll eat the berries and then taste various things to see how weird they are. I'm so excited! Though I admit to having a somewhat irrational fear of never having my tongue revert to its normal state again. I love sour food.
Aside from the experimentation factor, a main focus of the merchants of these fruits is that they allow one to eat non-sweetened foods, thereby reducing one's sugar intake. I guess they could be a good idea for diabetics. I'm a little more skeptical of the claim that they also reduce the effects of alcohol/hangovers, though perhaps I should put it to the test at this dinner

Oh and here is a site about them: http://www.miraclefruithealth.com/mirac ... _faqs.html