Review (5/5): Smooth knob is a safety feature!
Some reviewers complained that the knob on the bottom is smooth and difficult to grip with wet, soapy hands. I have had a razor with a knurled knob and I was always accidentally opening the razor head slightly while shaving. If the head is not firmly closed, the blade inside it can wobble during use and cut you. It happened to me enough that I went shopping for a razor with a smooth knob like this one. Also, after trying several razors I found this one and this is the very last razor I will ever buy.