I figured I would throw in a post since I just received my MS-HD from Amazon today.
First and formost I can finally crank my amp up to full and not hear even a slight buzz out of it even with sensitive IEMs. The sound is great. All sample rates work flawlessly in USB 2.0 on my MacBook Pro. The balanced outputs run hot and are indeed full range. The RCA outputs also have a nice high voltage swing and produce good results when hooked up to my Meier Corda HA-2.
I really like it.