This replaced our old Phillips digi-sender, which I now see was awful. With the Phillips, we had to regularly change it's position/channels to stop hissing, and it was affected badly by the microwave and router. This, however, is a smaller and neater unit, and works PERFECTLY. No hissing, not affected by bodies, no interference, it's great. I've not even had to put the little aerial things up. The only (slight) down side is that - to make the unit work without using the IR extender - you have to point the front of the unit towards the front of the satalite box - which to all intents and purposes means you'd be looking at the back of it - not an easy way to set up. But, to be fair, we had a IR extender on the old unit, and we now have a smaller, neater one on the new system - so we're not really down on the deal. To anyone complaining about the quality of the picture - get real. It's being transmitted through walls - it's never going to be HD but it certainly isn't as bad as the old analogue pictures that I used to watch. It's perfect.
Also, one last point, they can be tricky to set up if you've never had one before, so if it isn't working for you, it's more than likely going to be something wrong with the way you've set it up, rather than a fault on it - I'd just ask for further advice to fix any problems.
I'd really recommend the unit and Maplins as the seller. We ordered on the Sunday night, was despatched on the Monday, delivered on the Tuesday morning. Love it!Mini 5.8GHz AV Video Sender - No interferance with Wifi. Compact Size.