I, with one undergrad course in Modern Physics, think these Free Energy/Anti-gravity knobs might be onto something. They just discredit themselves with bad vocabulary. The Lifters are producing a thrust, and I believe they have shown to produce a thrust in a vacuum chamber (Purdue?). But to claim Anti-gravity is premeture or worse, sensationalism. Propellentless propulsion is a holy grail in it's own right, it doesn't need the hype.
The free-energy guys are claiming to extract energy from some sort of background radiation flux, it's no more free than solar or hydro-electric. Yet again, they sell it as a something for nothing scheme.
God bless FR!