As Al stated, a the valuable feature of the ULN-8/Amarra-4 is the capability for multiple source inputs and multi channel outputs to various amps. A significant selling point for me with the ULN-8 is how it solves both my immediate and identifiable future needs. Currently the ULN-8 offers the ability to be a great dac for all my iTunes alac and aiff files, it will serve as a phono stage for my new TT, and it can take over as my new preamp.
The manufacturer is committed to standing behind the MH hardware and software as their product line evolves to ensure a degree of future proofing for the ULN package. I see my main system eventually evolving because of my association with this forum, to comprise of a stereo TT, mono TT, PC (w/USB to spdif converter) running 16/24, 96, 176.4 and 192K files in foobar, my mac mini running iTunes perhaps a AES source of some type and possibly a reel to reel source. That brings it to six channels of input, up to four channels of digital feeding a tube amp, a set of monoblocks now and perhaps Klaus's Odyssey monos or a Pass amp in a few years. So who knows but if I get crazy enough all of this can be handled in one box.