Have had it for about 2 months now and am very happy with the work. I have a master unit that connects to my router on my second floor on the opposite side of my house. My office is on the 1st floor about 40-45 feet as there is no wired connection in this room, I have a second device and it is connected to my NAS (the WiFi signal reaches here with no problem so everything else is connected ). My wired connection is showing full speed and I haven't noticed any drop in network speed for my NAS since I moved it and used it to connect to my network. My house is only 7 years old so I can't say how well this will work on older power lines/houses.
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