Received the IPlate today, easily installed but didn't work at first, needed to bend the connection pins up a bit, as they weren't making contact in the BT wall socket.
So far the speeds are still the same, but the leaflet that came with it says it may take up to 3 days for the exchange to automatically adjust to a higher bandwidth setting.
Just have to wait and see now if it lives up to the hype I've read about it, supposedly giving up to a third extra speed increase...
