The claims are most likely overexaggerated, unless they were working at a high vibration and performing higher intensity exercises while on the machine.
I feel the best use of this machine is for bone impact and bone stimulation from the vigorous shaking while standing on the machine. For those with osteoperosis, or those unable to exercise, this is a wonderful machine that can give them the exercise needed to stimulate the bones and prevent muscle atrophy from the vibrations while standing on it. I have one. Even when you are standing on the machine and not doing anything but holding on, you are still working your core muscles and constantly contracting your core muscles to stay upright. I also like to perform balance exercises while standing on it to challenge my balancing abilities and work my core a little more. I also put my mom on it twice a week. She has Lou Gehrig's Disease (ALS), and at 70 years old, is still walking (slowly!) with a walker five years after diagnosis! Most people are lucky to live five months. I am sure the exercise helps, as ALS is a progressive disease where your muscles deteriorate until you can't walk, then can't move, then can't breathe. She does her exercises regularly, and that helps quite a bit.
Though I don't think it's the next weight loss miracle, I do think it works- if you are genetically prone to osteoperosis, perimenopausal or postmenopausal, have some kind of disease or disorder that prevents you from being able to exercise, or want to get some core challenge, this is the machine for you. If you're trying to tone up or lose weight- you are better off with traditional weight bearing exercises.