alt Hacker NewsI've been using this for a couple of years in my home now, with the same German Gigacopper devices. It's rock solid, very much unlike my attempts at power-line ethernet in the past. I used ethernet over coax in my last house too, which was also great.
I think many (most?) UK houses could get gigabit ethernet to at least some rooms without any new wiring. It's strange that the devices for doing it reliably are hard to get, but powerline ethernet modems are sold everywhere despite barely working in most houses.
My experience with powerline is they can work well for low activity, but they all overheat if you actually use them continuously, and the advertised speeds are extremely misleading as they are before error correction (which is very significant) and for the whole network.
My guess is that the nature of them being in a power plug means that they struggle to isolate things from the mains for safety in a way that doesn't also make them hotboxes.