First of all I purchased this based on reviews and reviews for other similar devices, seemed to be the best choice.
I have to say I have had similar problems as the other 1* reviews, could not get the unit to work at all, no signal whatsoever... I kept tinkering around 1 hour or more. The manual is a little vague so I put the devices in the same room just to make sure it worked.
This is what I did to get it to work (make sure you look under each unit which one is tagged as Transmitter and which one is Receiver). All OFF including the device(sky/player/box). Connected everything up (Transmitter to your device, Receiver to 2nd TV), still everything OFF. Switched ON Transmitter, switched ON device(sky/player/box), switched ON receiver. Everything works fine. When I had everything ON from start it did not work, no idea why but as an IT techie I though hold on lets do it step by step one device at a time. If your device only has 1 SCART port (of course it will only work on 1 TV at a time)... so get a SCART splitter or check if your device might have the yellow/white/red ports at the back that way you can use it on 1 TV and connect it to transmitter. Also make sure you try the SCART cable around if it doesn't as apparently one is for the transmitter and one for receiver but they don't have any labels to let you know which is which.
Tested but not extensive(sound/video great), I actually used the IR extension and stuck it to the front of my device and remote works great (took a bit of trial and error to get it spot on as I could not tell where my device had the IR sensor). As I did not test it for a huge amount of time, no idea if video/sound is intermittent while in use but from what I experienced it worked flawlessly.
Transmitter is downstairs pretty much right under the other room, double under floor insulation (the foil one and green foam one) under laminating flooring. The setup is quite simple, transmitter is on the floor with nothing else in the way or around it (wireless phones, speakers, wireless modem), I tried to avoid any interference. Upstairs the receiver is on the floor under the TV unit table so again nothing around.
Hope other people find this more detailed review of help. Besides the fact that it works just fine (video/sound/remote) and it does the job I got nothing else to say. 5* because it does what it is supposed to do.