I have the greater storage option of the "High End Set-Up" of the Meridian Sooloos system above.
MD600 - 2 TB RAID back-up storage/system core
MS600 - audio endpoint/dac
Simaudio 650D dac/transport
Simaudio P-8/W-8
Revel Studio 2
I can say that the dac in the MS600 is on par with the very well reviewed Simaudio 650D dac. Slightly different "flavours" of sound, but the difference is subtle at best. I can't wait for Meridian to offer their high end ID41 card (the one in the Meridian 818) in a Sooloos endpoint option without the pre-amp, which I don't need, at a more realistic price!
I tried the Simaudio 180 MInD streamer as well using Access as a library management software tool. Although the Sim streamer sounded very good, the Sooloos software is still lightyears ahead, and I stuck with Sooloos because of that.