Who are you guys kidding? Low-level light therapy with lasers is a waste of time and money. Anything that low-level (meaning low power or low intensity) lasers can do, at any wavelength, can also be achieved with an incoherent light source, like an incandescent light with a narrow passband filter that transmits the same wavelength as the laser. I don't see anyone selling tungsten lightbulb treatments to lose fat!

635 nm light, in the red region of the spectrum, is not dangerous unless shined directly into the eyes or has an intensity of many Watts per square centimeter. So the Zerona laser people can claim, correctly, that it is not dangerous and you don't feel anything. Well you don't feel anything if a weak light bulb is shining on you, so why should you feel anything if a weak red laser is shining on you.

Who am I? I'm a PhD optical physicist who has worked with lasers since 1963. I've seen it all, including all the scams perpetrated on the gullible public by people pushing low-level light therapy. I suggest that anyone thinking about paying for such therapy first do a little research on optical spectroscopy and the science of photomedicine.