RF, the scouse feds have bought one, to monitor crowds at events such as football if i remember correctly.
personally, i think it is a mighty dangerous thing to offer up, with minimal operational benefits.
certainly some of the areas i have visited, the locals would take great pride in shooting one of these things down and mounting it on the hearth.
and thats without considering the flight safety factors of operating a thing with several props over a congested/residential area.
but i would say that, for i am biased.
TFC