Right now I am leaving it connected to my Walkman on shuffle. Every now and then I listen to it.
Initially out of the box it sounded horrible. Soundstage was almost none-existent. The bass was muddy and harsh, gave me a headache listening to it. It cleared up after an hour or so of burning. Now it sounds more relaxed, the bass slightly tamer and tighter. And that is just a couple of hours after burning them in.
I can only wonder how they will sound like a week from now!