I've got the DLink wallplug adaptors, also rated at 200mbit. At my place in Austin, I used them to connect my machine upstairs to the router downstairs. Most places in the (1979) house, the adaptors couldn't even run faster then my broadband there at 22mbit. Finally found 2 outlets that seemed to work a lot better, hitting about 26mbit. Ended up finding some flat Cat6 cable at Frys and used that to run the 25 ft distance from the outlet in the hall back into where my computer was set up.

Looks like there are adaptors out now rated at 500mbit. I wonder if the speed increases actually mean better speeds when replacing 200mbit units, or if they are doing something that only works well on high quality close lines. One thing is for sure, the tech has come a long way from 1999 when Gateway sold 1.5mbit Intel made versions to help people start their home networks. About all those were useful for was dial up network sharing.