Almost my 1 year anniversary since pairing with the HD650s and I haven't looked back since.
Unbelievably great sounding headphones. When you read / hear the reviews about people stating the HD650s have "brought life back to their music" I can honestly say that it's true, like listening to a whole new song.
They really add to the whole listening experience, the added detail and clarity makes your favorite song an emotional journey. (sounds stupid I know but it's true) I appreciate mine so much, that I think it's time to mate them with a better source and amp.