I had 6 people in the room with me when I was in labour with DS1, but only had 1 in there when I gave birth to him.

For me it is definitely the less the better... I felt really on show and uncomfortable having so many people in there with me, even though they're people I love and wanted there anyway... I guess once everything was happening, I just wanted to be basically left alone. With my last labour (DS2) I had my DH, my DS1 & DD present and that was more than enough for me