Let me start off by saying this is a good product. At the same time you need to understand this product and what it can do for you.
I have a 30m cable running through my flat, it is an eyesore and if you're not careful it can cause you to trip. I would LOVE to replace it so I bought this product.
I can copy files between two computers over gigabit ethernet at over 100MB/sec. This means a BluRay movie in 6-7 minutes. Once I switched over to powerline networking I could not connect at all. This is not because of NetGear! this is because my motherboard has "green ethernet" which means it will try to detect if there is a connection and if not it will power off the (on-board) network card. Once I turned this option off in my computer's BIOS and logged into windows I connected to the network immediately, joy.
I could browse and use internet like I always did BUT when I wanted to copy a large file (2.1gb) I noticed it was very slow. It turns out from the socket that is in my room to the socket in my living room I can only get 10MB/sec. What this means is that I'd have to wait typically 10 times longer for the same files to copy which to me is unacceptable.
The LEDs on both devices were green and networking was fine but significantly slower than my normal ethrnet connection. Very disappointing. I tested various sockets around the flat, checked calbes and what not...the best I could manage is 17MB/sec which is not bad, but still nowhere near what I wanted. I would consider 30-40MB/sec but 17MB/sec is too slow.
So for people that do not need gigabit network speed, this is faster than WiFi & more reliable. It would have less dropouts in those all important video/voice chats! it will NOT slow your internet down or anything like that so I still consider this a good product.
So why 2 stars? because; it did not work out of the box without some help. the product says "AV 500" and just underneath "gigabit" while windows reports this is a gigabit connection it does not have gigabit speeds! it did not provide anywhere near 500mb connection speed (500mb = 62.5MB/sec) and it costs significantly more than a simple long cable. Also, it takes up a socket, uses more electricity than a regular network card and gets quite warm. While it can help eliminate long cables, it does mean that instead of connecting the computer to the router/switch you now connect to a plug which then connects to another plug and then to the router. So your one long cable became two short ones.
It will take a while longer before powerline networking can really replace your run-of-the-mill gigabit network but if you can live with slower speeds it's a great way to hide those wires away.
P.S.
A nice surprise was to see this product comes with two network cables!