Just received mine from mp4nation, tried various fits and found the best for me (red ring plus biflange medium), listened to some flac files on my Ibasso dx50. (just one hour). I'm sorry to say this, but i'm slightly disappointed. Probably i was too much hyped, due to the many positive reviews on the web, but i found them good, nothing more. I bought them expecially for the "beautiful bass" everybody speaks about, but i didn't notice a big improvement compared, for example, to my cheaper Vsonic GR02 Bass Edition. They sound more or less the same, just a bit more bright and defined, but for now i found very little that justifies the superior price. However, these are only my first impressions, i'll try new fits to verify if sound improves, but i don't think that it can change much. Sorry for the harsh review and language, i'm not english, i hope i'm understandable :)
Same with everyone else, first couple of days were 'meh' then after finding the perfect rings/tips combination, then it will be "BOOMM!!!"