I really enjoyed observing and think that was helped by having two. There were some long periods when nobody was at our section so could have been a bit boring sat on your own.
I don't think self observing would work because there wouldn't be any consistency on the sections.
All in all I think the comp was a complete success it was cool to see people push themselves trying gates they normally wouldn't be able to do. It was also really good to see so many people complete sections without dabbing.