Working out great. The Sony really shnes! The RW AUdio amp is great and the AKG K701's are tough to beat. The little tube buffer in the middle is nice but only noticable on some music, but since it isn't a detriment I haven't taken it out.
Later next month there is a small headphone convention in town and will get to hear quite a few other setups so I will have a better idea of how well it stacks up against top headphone setups.
Chris gave a listen last time he was here and he might have some good things to say about it.