I purchased my MC200, MS200 and MS600 at the same time. I ran the MC200 in my 2 channel system and then added the MS600. The MS600 improved the SQ, sometimes significantly. The MS200 is in my HT system downstairs so I haven't compared the MS200 and MS600 directly. If I get motivated enough I'll do that at some point.

Ken

Main: G68J, 5K2s, 5Ks, HSU subs, Pio 151FD, Dish VP722, Roku, Wadia I70, Anti Mode Dual Core, Oppo 103D Vanity Lite
Office: SBT, Berkeley Alpha DAC 2/MQA, Magico S3 Mk II, Boulder 2060, Lumin U1 Mini streamer, Roon.