Good to hear you had a great time.
I had the worst concert experience of my life in one of the SR show I attended (UK), so I'm just sharing my opinion. It's up for others to decide.
My experience so far with the 4 SR shows that I've attended is that sometimes the audience gives the respect the music deserves (Japan), but more often than not they don't.
So will I attend another unseated, outdoor/festival Sigur Ros show? Probably not.