What does Mantis do that REAPER does not? - Given MQ-9 is doing it NOW (or so the MoD web sites will have you believe), and not in a plastic airshow mock-up or Power Point Presentation of a wind tunnel model. ....and what language will it communicate woth other aircraft / command and control / supported agencies etc,,....?
...are the Brits a little behind here or are they so novel that they are streets ahead...?