I was at Burning Man 2007. I took one pill and went out into the festival on my own, it was a soft subtle warm glow that suffused the entire night and made me feel amazing, but never overwhelmed me or made it difficult for me to feel natural and at home. I danced and made friends all night at Entheon Village. Freq Nasty was spinning. I didn't feel any kind of comedown or hangover at all. It was fantastic.
I've had much better experiences with MDMA since then, mainly because I've dosed higher, rolled with good friends and romantic partners, and become a better dancer ... but the ease, beauty, subtlety, and exclusively positive nature of that first experience was really important.