They are already pretty awesome. You can hookup multiple units throughout a house. I use it in my apartment for gaming on my laptop and for my streaming devices. I use Zytec (spelling?) or something - bought it a year or two ago. You plug one into the wall near your router and plug an ethernet cord into it. The other units get setup wherever you want so long as you have a power outlet. I then use ethernet from the wall outlet into a switch and I can share wired low latency across multiple devices in different rooms. Trying to copy Gb files from a wireless laptop to a wireless netbox can take forever. Ping in games goes up with a wireless network. These things are a god send.
I have 2 of the Belkin AV500. They work really well in the areas of the house where the wifi signal was weak. One of them feeds the flat screen tv, which made HD streaming from Netfilx work great. Although this model doesnt have the passthrough, so gave up an outlet plug in order to use them. But everthing else is on a surge protected strip so not too much of a problem.