Don't wait! Replace the Head now!
I did nit realize how worn my original head was until I got the new one. Unlike older models where you can replace the foil or the cutter, this is the whole head.  What a difference.  While the foil on my old one was intact and the cutter felt sharp, I did not realize that the springs were worn and the head was not floating as it should.  This reduced the shaving efficiency. The new head fixed that immediately.  Shave was back to the old, fast and super-close shave I love.  Replace yours every 12 months as recommended.  I waited 18 months.  Never again!
Rating: 5 stars