If you've got a Cowon player, buy a FXC51 and never look back. Actually, it's hard to look back after hearing it.
Just got done with it against the GR07, and the GR07 is definitely heading out. Honestly, this is just insane.
My portable rig will stay the same pretty much forever. Haven't found anything that comes even close. Not kidding.
I love it when a $24 earbud becomes the new giant killer, I always thought that the GR07 was overpriced at $155 anyway, JamesMcProgger and myself bought the FXC51 as well, let's kill those giants people.