The No-No is a scam, in my opinion. Do some research on the web but make sure to avoid the myriad sites actually created by the sellers of No-No that purport to be 'independent' reviews of the device.
There are sites devoted to hair removal. I suggest you read the opinion of those folks, as well as doing your own research on how laser and electrolysis work to stop hair growth and then compare that to a shoddily made, hand-held device. At best the No-No has a temporary effect, but then so does shaving and epilating, both of which are considerably cheaper and produce better temporary results (again, in my opinion.)
Do let us know what you find out from all that research.