OK, I bought one today. First impressions are not good. It is just a dongle that plugs into a HDMI port on your TV [so if you don't have a spare one its US]. It comes with no software or manual but you don't need a manual as there is very little to it. You also don't get software as only apps written for it will play to it and they appear to be few and far between. Youtube is an app that supports it and I have run that OK but I can do that anyway through my Panny-735. I wanted to play mkv/avi's from my tablet and phone to it but I'm not holding my breath !
As I said, its only £30 down the drain. Basically it is for folks who have no other way of connecting the TV to their wifi [it is cheaper than a wii/xbox etc].
I'll update you all when / if I get it doing anything.