Summary: This information is for the TL-PA511 model which I purchased from a source outside of Amazon but I would imagine holds true regardless! As far as I can tell the only difference between the 511 and 411 model is that the 511 has a gigabit NIC, so if you have purchased the 411 model then the fastest speed you will get from it is 100 mbps due to the slower NIC.
Summary: I just got these to help someone for use in their apartment. That building had wireless interference all over, and some of the walls were concrete. A wireless signal there couldn't even reach 35ft. With the Powerline adapters, I literally just plugged them in and they worked instantly. I was worried that since the building was around 40 years old, that the electrical wiring might be an issue, but it wasn't.
Summary: This item is as described. In reading some of the other reviews, I believe the confusion is in the initial paring of the units. All I did was plug them into two different outlets in the same room (clearly they were on the same circuit) and paired them, I did not even bother to plug in any Ethernet cables. I then moved one unit near my router and the other unit to a distant bedroom, hooked up the Ethernet cables and everything worked as described.
Excerpt: Works flawlessly and will be getting another set. Ran full, 1080p video from a network stream in the office upstairs, through the powerline and then into the router in the bedroom. Very happy with this!
Summary: I've had this product for about a month. Would recommend for desktop users using a wireless connection.
Pros: Plug and play. Not sure about all the technical read/write download/upload numbers, but it seems to be working. Less hangups than the wireless connection I had. Also a huge improvement in latency while playing games like Battlefield 3 and Black Ops. My router is in the second floor while my computer is in the basement. Granted, I'm the only one in the house using this product. Everyone else uses wireless so I cant say much for how this product works with more than 1 p...
Cons: I wish it came with a longer cables. I think they're around 4ft, not sure, too lazy to find/open the box. But luckily I had a few of my own cables lying around. Also, not totally sure if the security works. Don't really have a way of checking it. I just pressed the only button there on both of the devices and hoped for the best. Guess I should've read the manual...
Summary: Had wondered how well these worked and decided to get a pair on sale. they are a little bit bigger than I expected, but were very easy to hook up, and provide much better speeds than my wireless does. Works well coupled with a switch.
Excerpt: I used this to connect my Blu-ray in my bedroom and living room to my network - mainly to stream netflix and vudu. One bluray had wifi and worked pretty good, but you can really tell the speed difference now. Really was simply plug and play! I have 4 of these connected up, you do want to try and find the "right" plug in the wall to get the best connection, but even at the "slowest" speed it is faster than wifi.
Summary: Very easy to use and install. Plug and go essentially. No more hassle with feeding wires. Works great for smart tvs that do not have the wireless dongle but have the Ethernet port. Fast, reliable and overall superb product.