I am about 5 and half. However I did mmmf with a woman and her husband and a really big black guy. He was about 10 and thick, very impressive. I sneaked in a quick suck but he waved me off. Wifey loved it. But she liked a lot of filling. She was not very expressive, so there was nothing to see on her face when the big guy got inside her. Although she did make some satisfied sounds to her hubby afterwards.
The big fellow did not have much to say for himself. He had heard everything that can be said or experienced about big cocks. To avoid any arguments or abuse he had learned to remain fairly neutral about the subject. Of course he was really successful and busy, but again he did not go into detail. Being part of the code of discreet swingers etc.
So that's why you don't get to know much about these guys with monster knobs. They are too busy and they are extremely discreet. But when they turn up, give them room and watch or join in with something a bit larger than life.