I can verify the zapper effectivness. I didn't have remarkable results for the first 4 years, but the zapping [and Amalgam removal] did get me out of the bed and into a fairly normal routine again. I still felt bad most of the time. But the pain gradually deminished to minimal.
Then I discovered that I had a very high level of PCBs and that my jaws/throat/sinuses/brain was still polluted with amalgam. Dr Clark says that PCB toxin somehow depleats power of the zapper. Therefore, I used her recipe of ozonated olive oil to detox the PCBs and now my recovery is accelerated.
For maximum zapper effect, get the new zapper with program drivers. Awesome.