What receivers/endpoints do you use? My network (wired Gb with ASUS RT-N16) IS up to snuff and even when I isolate just the two devices (HR21-700's) with nothing else there is periodic disruption. Lot of other factors in play like disk activity, CPU in the device, ............... For me the bottom line is the receivers are just too underpowered to do a lot of multitasking. I know I'm repeating this but I believe the feature should be in the DVR Plus package as we've already paid for the receiver, DTV limited our storage and won't let us upgrade easily (wo/buying new equipment and a long term lease), we already pay an extra receiver fee, ........ :)
I have a very simple setup: 3 HR22-100 and 1 H21-200 hardwired to a Ethernet switch which is hardwired to my U-Verse router/gateway. After the MPEG4 problem was fixed (the current NR has it fixed), not a single dropout watching basicaly only HD in MVR. Very often, my wife is watching a separate program also using MRV. Before the MPEG4 bug was fixed I was about to give up on MRV but now it's perfect performance-wise.
I do expect MRS (multiple room scheduling) soon or whatever name they give to allow remote management of todo list and serial links. MRV will be well worthy the 3 bucks then.