I notice even the smallest stutter, I think maybe some people are maybe just more intuitive and perceptive than others. I've always observed people from afar because speaking wasn't my strong point and from that I'm able to notice very small details of a persons personality, especially stutters because of my own. Maybe it's in the genes as well. Anyway, it's noticeable if you look closely but to the regular ear of non stutterers I'd imagine it's barely noticeable. He is so strong to be able to talk to the WHOLE WORLD and barely trip on a word.