Bought this to extend my home network into the back of the house where the wifi signal was poor. Worked in 30 seconds straight out of the box - brilliant.
Each end is on a different ring main and the signal strength is still fine - much quicker than my wifi is, so much so that I have got a second pair for my other devices.
I am now using a single port adapter to take the network from my router into the mains, a 4-port in the lounge for a ps3, sky+ box, smart tv and media pc, a 4-port in the back room for an office pc, network printer and nas drive (and occasionally a work laptop), and I have one more single port adapter spare.
Loses 1 star as when putting more than 2 devices in the network the built in security button doesn't work very well - they tend to form two groups of two. Thankfully the bundled software is excellent, and can be used to locate all devices at once and set a security password