Mine arrived 1 hour ago. I must say after owning every audiophile headphone of Sennheiser. The most Wow effect was long ago with HD650 and HD600 and some years later with the original HD800. (then i had hd700, hd800S, Ie800, Ie800S, not much wow effect.) Here comes the Ie600, i never thought i will have the same wow effect again like 10+years ago, and yet here it is. This is a marvelous neutral sound, it feels so lifelike, so extended in both end still neutral mids with all of the details and good stereo image, and dymanic ,clean, fast sound , i never had this with any iem which I had ( Ca Andromeda 2020, CA Atlas, AKG n5005, ie800/S , Final Audio A8000, Dunu Zen, Sony Xba, N3, and a lot chifi iems) . I must say this Ie600 is one of the best iems i listened Money no object.