Thanks Ian for that sober and comprehensive post.
I re-read the review and wondered about the MD600 -> MS600 connection. The reviewer has used "fancy" cables for the purpose of connecting the two devices to the router. Given that he has them stacked I wondered (a) if the vibration from the MD600 drives could be affecting the MS600 (see section Sidenotes) and (b) if a router is actually necessary to connect the devices; they both have IP addresses and, in this set-up, only transmit one to another; surely if there was no router at all that would eliminate network latency and mis-transmission events?