A few people have been scammed on the site, Only use paypal to pay for items for sale by other members. If they will not use paypal, its likely a scam NEVER SEND E-TRANSFERS OF ANY KIND.
This is a good read and I can believe many of the claims.
But then it is still new tech and surely many of us will not want to be guinea pigs with our new NCX.
However, the technology, especially the magnetic part, is surely logical and believeable.
But at US$120?
Hmm.
I will stick to oldschool paper filter, which I can also examine, and I can throw it away after examining.