I have an opinion :-)
It may have some beneficial effects, but I think it is greatly over-hyped. I have a couple remarks on their marketing material:
"The local heating causes an immediate contraction of the collagen fibers and at the same time increases its metabolism"Collagen fibers do not have a "metabolism".
"It is recommended that the STOP™ device not be used more than once every other day. Letting the skin rest in between each treatment is important to allow the natural process of the skin’s collagen renewal to take full effect."
Collagen regeneration takes (many) weeks, not 48 hours.
Their "clinical papers" are suspicious. When you read the final sentence, they admit (because they are obliged to by law) that the ones doing the testing have been paid by the producer of the device, Ultragen Ltd. They do not mention how much money Ultragen paid, but there are millions made with such gadgets. They sell for 250 Euro or thereabouts but are made in China and cost about 25 Euro (or even significantly less) to make. It is not too hard to find a few dermatologists willing to tweak their results, in return for a generous "study grant". We see that all the time with such devices. Such "studies" look bona-fide at first glance but at closer scrutiny are nothing more than advertisements.
When you look at the website of the device's manufacturer, you'll see they market similar devices, with claims as "melt away your cellulite". Sorry folks - there is nothing much you can do against cellulite. I did my homework on cellulite and if there would be anything that "melts away cellulite" I would have given it ample attention in my
Cellulite article.