I purchased these adaptors and some
Netgear XAVB5001 Powerline AV 500 Adapter Kit to upgrade a powerline network based upon some older Netgear HDX101 adaptors. I bought a mixture because I wanted the plug-through option in some places - experience has taught me that plugging into power bars or, even worse, surge protectors really do reduce the performance of powerline technology.
Setup was dead easy - just plug and play and the devices establish the network on their own.
No need for the management software supplied on the CD, but I installed it anyway and had problems - it ran once and then kept failing. Uninstalling and reinstalling didn't help. However, I downloaded a newer version from Netgear's support site and that was fine so I'm still giving the product 5 stars. I also updated the adaptors to the latest firmware by downloading the update utilities from Netgear. Firmware update can be achieved over the network - no need to plug a PC directly to each adaptor in turn.
The performance has been great. Forget the headline 500 Mbps number - that is the physical rate and real world performance is unlikely to come close, just as with many other networking technologies. The real question is whether or not the network will reliably handle multiple devices (PCs, TVs, game consoles) accessing the Internet, including streaming video. The answer is very definitely yes.
I've got multiple ring mains and tested access to my 50Mbit/s Internet connection across two ring mains. The result was excellent - more or less 50 Mbit/s reported from multiple tests. Faster speeds might be achieved between PCs in the home, but I haven't bothered to test. (The HDX101s only managed 9-10 Mbit/s over two ring mains, although they did deliver 25 Mbit/s on a single ring main.) I can also reliably access iPlayer HD content from a TV, whereas with the older devices even SD content experienced problems at times.