The "concept" is good but I'm not completely understanding their expertise. Yes, as dancers who understand movement but physiology? Not sure. I suppose you could try it. Facilitated stretching shouldn't be intense so if it doesn't ease in to increased range of motion I'd back off.
That company sells special clothing for stretching. If you don't buy their clothing, maybe the method doesn't work!
More seriously, stretching, like most exercises, can be taken to dangerous limits. Dancers who don't do that mostly don't get professional dance jobs. So they use everything they can, including physiology studies. You can nourish your body and otherwise place it into a state that make stretching safer and/or more effective.
But I'm not the expert to give you the details.
I'm drawn to it because it seems less "intense" than other exercise classes, and because it looks like I could do it occasionally as my schedule permits, rather than committing to a weekly class. I know I badly need to improve my flexibility, and I'm a little intimidated by the thought of joining a gym or doing other classes. Also, having someone do the stretches for me appeals to my laziness.
But I think it feels a little too much like a marketing strategy (trademarking the method, the logo clothes) rather than a technique that has been truly validated through actual research. (science geek wants data!) No pricing on the web site that I could find, either. It's right around the corner from some restaurants I frequent, though, so if I'm in the area I might drop in to check it out.
How about going to some yoga and/or pilates classes? Stretching + core work.
I've been thinking about those too. Once my big administrative responsibility is done (T -207 days and counting!) I think I'll have time to sign up for something regularly. Plenty of options in the area, ranging from big gyms with regular classes to boutique studios. Leaning towards pilates over yoga, partly because it appeals to my geeky nature more (not into the woo factor you get at some yoga studios).
For now maybe I'll just be happy that with the stretching I've been doing on my own not only can I touch my toes, in a seated hamstring stretch I can actually grab them! Baby steps.