I can honestly say that although I have only gained 3/4 inches so far (in length), my fiancé can definitely feel the difference. Often now, when we are having intercourse, she tells me not to go full depth; before this never happened. Also- as far as girth is concerned (although not part of the original question) adding even 1/4 inch to girth is a significant increase in volume. My fiancé certainly notices that I have increased in girth, albeit she is interpreting the added girth as increased hardness right now.