A DE or straight razor shave on the head or face is supreme in comparison to the more "modern" methods, and more cost effective (if you control the addiction!)
I personally use DE Razors to shave and have never looked back.
And to those commenting on the video! he didnt have very long hair but you can hear that its scraping and shaving .. hes probably just going for that smooth glass feel. And again what shocked me is not because its just another knife shaving video, its the LONG strokes he took!! realy scary imo the guy is totally "zen"