I have used multiple rife machines
The spooky plasma is by far the best, followed by the Spooky GenX
Rife basically saved my life and I am still working at figuring out the best method of using the tech.
the GB 4000 is old tech, and over priced. Just get the Spooky plasma, its cheaper and better. Truerife F-117 is okay, but nowhere near as powerfull as the Spooky plasma while being more expensive. Some other things touted as rife machines are just flat out scams.
Spooky has a huge data base of frequencies you can use but I have had the best luck with DNA targeted freqs. You buy the set once and can use it for life. I am using the Staph A (for MARCONS) right now and its working great. I am discovering though that the higher the freqs the better the results.
If you get a spooky let me know and I will explain the best way to use the frequencies. https://www.dnafrequencies.com/