I recommend the Turbosonic for people who have major back pain and who cannot handle any friction. For someone that has a hard time jumping rope or running this machine would probably be the right fit. The ballistic impact is the lowest on the sonic machines than any other machine. For lymphatic cleansing, you can't find a better machine than the Turbosonic. They are the ones that started it all with sonic vibration.
The best way to describe how it feels on Turbosonic is when the plate decelerates to the bottom all my cells feel like they are compressing, kinda like when I am jumping high on a trampoline and then at the bottom of the bounce I get that "halting" feeling. It brings me to a stop without any ballistic impact or jarring. When standing on my heels the G force felt like a sine wave, there was less of a pop but more of a rhythmic motion. Because this is a linear type my body is airborne the most with the sonic. It almost feels like jumping on an air cushion.
The difference in the sonic machines on the market have to do with the quality of the 3 main components - the chassis, the diaphragm or cone, and the voice coil actuator. The voice coil is actually a linear motor. It is what makes the plate move up and down. This actuator is directly attacted to the plate instead of a loudspeaker. Some of the sonic vibration machines can now play music. If you stand on it while you have it cranked up you feel like you are standing in front of a loudspeaker at rock concert. It is fun to feel the music while you are vibrating.
The sonic machines keep coming down in price every year as the technology gets cheaper. In 2008, a machine in the $4000 dollar range today would have costs to $10,000 back then.