I would want a whole lot more proof for that price. A whole lot. Even the cartridges are expensive given that you have to use one per day.
It is cheaper to get a rebounder and use that for 5 minutes a day instead. Or just run in place, jump rope, or squats, or other similar exercise.
"The best and most beautiful things in the world cannot be seen or even touched — they must be felt with the heart." — Helen Keller