I'm not sure if mine will be suitable for streaming HD content, but they seem fine with SD content. I will have to wait and see when the TV Portal becomes available.
I'm using 85 Mbps home plugs and they seem to cope well using BBC iPlayer.
Well, thats one of the few benefits of living in suburbia.
1Mbps does sound hard to live with, must be 10years since I had that.
seen a post on ds about using a wireless usb dongle. a wireless router could be used, if set up right