I read the reviews and understood it was a roll of the dice. Decided to take my chances, and sure enough, in my environment I got no signal.(Actually I did get signal between certain outlets, but none in the rooms I needed to connect.)It would be nice if there was some kind of inexpensive testing kit to determine ahead of time whether this would work. They do seem to be accustomed to returns though, the box has clear repacking instructions on the inside cover.