Ignorance is bliss, perhaps?
NASA have also researched the Biefield-Brown and Mythbusters also aired a program on this.
NASA lists it as an IONIC wind device, so it won't work in a vacuum.
For anyone with an interest, go to youtube and search for "lifter antigravity" and you'll see some interesting backyard videos of quite a number of people who have built working protoypes. In the US, there are a number of school fairs and science expos that have demonstrated the principle. Google "Biefield-Brown" and you'll see a number of academics showcasing their work for school projects..
In their current state, they show limited use, but more R&D could be put into refining the technology.