Plus points: Marks you definitively as a man.
I noticed a subtle change of attitude towards me when I walked into shops. I think it says you don’t care about looking boyish or effeminate any more (or you just don’t give a d*mn).
I’ve been told it makes me look more ‘distinguished’, and older.
Negative points: Makes you look older. Tends to put off women, except those women who like beards. Needs to be trimmed and shampooed, same as the hair on your head.