After two months of listenimng to HD 25-1 I can say I love them a lot. There is something magical about the sound they deliver, clarity, softness, detail.. eargasmic probably is the word to use. I have auditioned HD 650 paired with a nice amp too and was not so very impressed, I love HD 25-1 more, it's a flavor that cannot be forgotten once you tried it. Also HD 25-1 benefit from amp and good source quite a lot. But at the same time I can listen to some good quality mp3 128kbs radio stations and feel no distress, unlike with HD 595s and HD 650s. It's like they smooth it out somehow yet maintaining clarity and some punch. That is magic. With brake-in they got smooth sounding and clarity is simply amazing, the initial harshness went away and now my ears relax listening to music.