I don't have a problem with the sides...but the back was a problem for about a week. Then I learned that the hair on my back seems to grow differently on the back of my head. I have to shave sideways on the back of my head..wierd but it work. I start from the center and then shave (actually against the grain on the back of my head) with a sideways stroke. I also find that if I lean forward for some reason I get an ultra close shave.