Good article. Thanks, Matthew!
I read the linear 300m range, for the DHP-600AV anyway, as the maximum length of electrical wiring between adapters, not the allowable length of CAT twixt an adapter and device.
Powerline networking has had ample opportunity to mature. If it can't sustain 200Mbps, it is of little use to me or my clients. Scenario: Someone wants an Ethernet drop in three rooms of his house. That's $300 in hardware alone... Does the hardware for multiple drops of Ethernet interfere with each other and how badly? I can only imagine that in extreme cases, where CAT5e/6 can't reasonably be run, would this even be an option. Too bad, really...