Summary: I read a lot of the negative reviews and was a little worried but decided to give it a shot. It works great is way better than my weak wifi signal. I have the modem upstairs on the other end of the house (about 2500 sq ft) on a different circuit breaker than the intended outlet for this.
Summary: Have four of these units and they work flawlessly. Get very close to the same speeds as my desktop wich is directly connected to my modem. Hardly ever looses signal -- and when/if they do, a simple unplug/plug at all the stations solves the problem in mere minutes. Very satisfied.
Summary: I was having trouble with the quality of streaming on my new SmartTV hooked up over wifi, which is on the opposite end of the house from the router. HD quality would drop to a pixellated mess randomly. After some research, I came across these little doo-dads.
Summary: I did not test the adapters with anything other than my Ooma box so I can't say how well it would work for streaming any other data.
Pros: Easy setup - Just plug it in
Cons: Did not work with my Ooma box VOIP phone system. I wanted an easy way to move my Ooma box without running a LAN cable through my home. I was able to do this with the Powerline adapters, and I could make and receive phone calls, but the sound was is garbled that it was completely useless.
Pros: As the title says Device was Plug and play, I have had no issues with it and been using it for 3weeks now to go from my downstairs computer room to my upstairs bedroom and that takes a trip through a breaker panel so its pretty impressive. Great price.
Summary: Pros: Very convenient and more reliable than wifi. Also supports easily adding additional AV 200 nodes (I have 3 that talk to each other, to bridge wifi-enabled APs/routers/switches in the family room, office and upstairs guest room).
Summary: I already own the Netgear 85Mbps Powerline Network Adapter XETB1001, which I use to stream HD 1080 from my server, it has worked flawlessly for 2+ years, a single HD stream requires ~6.6Mbps bandwidth to work well.