Correct, its a con.
My road has fibre, the green box is 0.2km away from the exchange, and 1.5 km from the building (though I do not know if the wires go the way I paced it out).
At least one house is getting 22Mb on fibre, while I am getting 18Mb on ADSL2, at an approximate distance of 1.7km
When and if they put in a green box less than 0.5km from me, then I will go fibre, as at the moment it is not economically sane!!