These were out of the box and working within a couple of minutes. One plug was patched into a broadband switch/router courtesy of the auto-uplink feature, and the other was connected straight into a PC's Ethernet port. This connected fine at 100Mbit/s, which was the speed of the PC's network card. Because it's using the standard network port, no extra drivers are required on the PC, and worked just as well with a Linux based Eee PC as a Windows based box.
There are some restrictions on how you can connect these Homeplugs. According to the accompanying leaflet, they must be connected directly to a wall socket, not through a power-extension strip. They must also be on the same mains ring, which shouldn't be a problem for most homes but might be an issue in the workplace.
These dLAN 200 plugs are not cheap at around £60 per connection, but are a bargain compared to the cost of getting network cabling & sockets properly installed, and much tidier than running ethernet cables on the floor. If you're not planning to stream HD media, consider the cheaper 85Mbit/s Devolo Homeplug , which isn't going to be much slower for most purposes, or Wireless LAN (54Mbit/s). Both of these would be fine for typical web-surfing, gaming or occasional file transfers. But if you want to stream HD media around your home and don't want the expense and effort of laying Ethernet cables everywhere, then these are what you need.