I ordered this at RMAF from Blue Circle Audio based on a 5 minute audition. Mine is configured as both a SS headphone and preamp. I plan to use the preamp with my Quicksilver Mini-Mite monoblocks, McCalister PP 160 and Rogue Atlas. The unit i have is designed so the headphones and preamp can play at the same time. Both have different volume controls, but share right and left gain controls. The preamp section has switchable high and low gain.
http://www.flickr.com/photos/20989038@N04/sets/72157603216939944/I'll put this on headfi if they ever recover from their crash. A review will follow in a couple of months.