Powerline Ethernet Bridges

[Lunchie]

Wrong place - reposted in connectivity forum.
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Has anyone had any experiences with these?

I need to connect an ADSL router to a computer at the other end of the house. I've done a WiFi survey and the signal attenuation between the two locations is too high for a permanent link. Then I spotted a writeup on these ethernet-over-mains powerline routers and thought, aha!

But before I rush off and spend £70 on a pair i'd thought I'd ask here first.

My principal concern is whether they'll actually connect as the chances of the two sockets I've got in mind being on the same ring are tiny. Does that matter? can these things cross on to different rings via the fuse box?

All info/insights welcome.