Just bought these in new condition at HALF the retail price , after recently started reading about them, paid just 150 euros for them... what a finding!   As soon as I got them to work, 2 colleagues tried them, and they both ordered a set in 5 minutes time!   My previous reference as a "quality" everyday set of headphones, were my venerable Koss Porta Pro's, that I continue in love with. But of course, the Momentum are in a total different league.   I'm in the process of finding a decent amplification to them, I have a Samsung Galaxy...