I just picked up a couple of MoCA adapters to replace my wireless (G) and I have to say I'm not impressed. It seems like there isn't much benefit unless the signal was really spotty to begin with. I did a transfer test with wireless vs moca and got these numbers:
Wireless : outgoing (pull from HD to Premier) = 15.17
MoCA : outgoing (pull from HD to Premier) = 11.91
Please tell me I didn't just drop $100 on a bunch of MoCa gear to get worse performance. I have the Actiontech adapter from tivo.com at the router and I bought a channel-master 4-port bridge+hub for the TiVoHD side (obviously using the Premiere's built-in bridge).