got mine today. ah, am i wearing my hd439? sound is exactly the same. sennheiser must be kidding! there is absolutely no difference except the he439 is comfortable and the momentum is not. never say never, but i guess it will be my last sennheiser for a longtime. its not bad, but hey, you can get the same sound for 60 bucks. do not think, the fancy leather style is worth 5 times the price.
The more and more I listen to the Momentum, the less I'm impressed. I'm happy I went with something else.