I have been using my Roamio Pro + Mini so far with the Pro acting as an ethernet to MoCA adapter and the Mini using its built-in Moca and it has been working great, but the entire system is connected to the internet via powerline and that is not the greatest connection.
Here is a loose diagram of my current system (and yes, I do have a MoCA POE filter at the entry point to the house):
Den: router -> powerline
LR: powerline -> AV switch -> Pro -> MoCA
downstairs: MoCA -> Mini
downstairs: powerline -> other devices
So, I saw this Motorola MoCA adapter kit
at BB with a pair of adapters, a 1-port for the router end, and a 4-port for the remote end. I thought this could be an upgrade from my current powerline based system. My plan was to get rid of powerline entirely and use MoCA as the backbone, with the 4-port MoCA adapter downstairs feeding the mini and the other devices there, the Pro in my LR AV cabinet bridging the AV switch to the internet via its built-in MoCA, and the single-port MoCA adapter in the kit being used to connect my router to the MoCA like this:
Den: router -> MoCA 1-port adapter
LR: MoCA -> Pro -> AV switch
downstairs: MoCA 4-port adapter -> Mini + other devices
The first stage went pretty well, I connected the router to MoCA, disconnected the powerline in the LR, and rebooted the Pro for good measure and it was able to connect to the TiVo service. I connected a laptop to the LR AV switch and saw about double the throughput that the powerline was giving me, but the ping times went from 2-3ms to 3-5ms. Not perfect, but the extra throughput is a good thing.
The second stage was to connect the 4-port MoCA downstairs and get all those devices hooked up to it. Here is where I ran into problems. I hooked up the MoCA adapter and did some tests with just my laptop before I hooked up any of the other devices. I measured uplink speed and it was great - as fast as the LR and much faster than powerline had been giving me down there. I then measured downlink speed and it was at the same excellent high rate. For 2 seconds, then it disconnected. Every download test I ran gave the same great rate, but only for 2 seconds (though uplink ran fine).
So, where might my problems lie? Is the Pro trying to drive the MoCA perhaps instead of just listening in passively and causing a loop or feedback? Is this what happens when I have bad splitters in the walls (but consider that the uplink is fine, only the downlink drops and always gives a good rate for the first second or two)? I didn't put a MoCA filter on the cable modem, but I didn't have one before when it was working with just the Mini on MoCA - and I'm not sure how that would cause this problem (the speed tests I was running were entirely local to my home network).