IMO they're worthless. My wife spent a fortune on the Braun Activator self-cleaning razor as a gift last year. I tried it for a month and went back to the good 'ol M3Power. Perhaps it was me, with the electric I just don't get as close a shave and also had much more stubble and razor burn. I get the job done more quickly and neatly with a normal razor (if one can call a vibra-razor normal )