I initially tried a GB4000 that a neighbor had used to get well. He had been an antibiotic failure and had turned to Rife and it put him in remission. He still has to use it once a month to not relapse though. I definitely herxed from the GB4000. However I decided to get a Spooky2 as it was $200 vs $2000 for the GB4000.
The one thing is that there is a lot of "religion" in the Rife world about
which machine works best. It's almost as bad as the essential oil world where housewives will claw each others' eyes out over which company is truly Certified Ultra Pure Therapeutic Mission Critical Grade.
The thing is that electrical frequency generation isn't really rocket science. Spooky2 is part hardware and part software to reduce the cost as most of the "brains" is in a free software program.
I think Plasma Rife is really what the more advanced machines do differently as this allows better signal transmission into the body. GB4000 offers a MOPA add on which drives a Plasma tube.
The Spooky team actually just released a Plasma system that attaches to the frequency generator:
spooky2.com/transmission/plasmaMode/index.htmlBut the basic handheld contact machines do certainly work as well.