I got to meet the inventor Luther Blacklock last year when I organised a golf day and arranged for him to speak. Great guy and explained(!) the theory of the Explanor very well. So well in fact that my brother bought one...
I've got to say it has really improved his game. He has played for years but with a out-to-in swipe causing pulls and weak slices. After owning this for since September last year he now has now changed his swing to a far straighter swing path and has a lovely soft draw to his longer clubs.
As people say, it worked for him but may not for others. He has used it regularly throughout the winter though!