Did a lot of searching around and reading blogs on the performance of different av senders which generally said they were all poor. Threw that all out of the window when I saw this and just went for it as it was the cheapest I found! Had a play around with it on different frequency channels and found 4 was the best for my house. It is SO clear, could not be happier having heard how bad all senders were - the signal is as good as the tv downstairs.
2 tips -
1.) Play around with the channels on the bottom of both the sender and receiver but make sure they are both on the same one when trying it.
2.) When testing it don't sit right in front of the tv and receiver as this will effect it. Just sit where you normally would when watching.