Just got the OMC, all very nice and lovely. Apart from the headphone socket.
I downloaded grooveshark and listened to some music via my headphones (decent pair).
It sounds awful - as if your stuck in a steel factory. I wasn't expecting it to be as good as my iTouch but this is just awful.
I also tried youtube and got similar results.
Now the key question: do those of you that have put a custom rom on your phone experienced better quality music when listening via headphones? I'm trying to figure out if rooting the device and changing roms is worth my time - otherwise this device is headed straight back into the shops.
TL;DR: What is the quality of the music/sound that comes out of your OMC when listening via headphones? Is it awful like mine?