Yesterday I received the HE1000se in the mail and listened to them all day, wonderful headphones and excellent sound. I listened to a lot of different reviews before deciding to buy them, and they sound just like I imagined. Even out of the box they sound great, but I think they need time, more hours of work, to sound even better. You still need to experiment with different cables to understand whether there is a difference with the stock cable and whether this affects the sound.
I think that the sound of the HE1000se is without any coloration, it sounds natural, good bass and deep subbass, smooth mids, and detailed high frequencies that do not tire the ear. Of course, this is only a preliminary opinion, because I listened to them for only 8 hours and they need time for the sound to fully develop.
Sorry for my bad English :)
Thanks Andrew and MusicTeck