Re: powerline is it worth it?
I've not used them myself, but friends who have used the more modern varieties have reported good things. Just be aware that they need to be on the same ring to work properly.
FWIW, the old ones (a few years or so ago) used to suck like anything. Slow, expensive, and dropped more packets than a postman with no hands.
Save the whales, feed the hungry, free the mallocs.