I purchased RE0 after a lot of thought and research here in head-fi forums. At first I was puzzled by their sound. Having used only Sennheiser CX 300 before I found the sound to be too complex and the highs too pronounced. I had them playing virtually all day long (and night) for the first 3-4 days to burn them in as I knew that they require a long 150+ hours. I was also using them while burning them in to experience the differneces in the sound. The most notable difference was the bass, that really became more tight and clear. Bear in mind that I...