See Duellists YouTube vid:
https://youtu.be/AIe_160lwVY
Which indicates they are useless now.
Intended behaviour seems to be otherwise:
https://github.com/FAForever/fa/pull/3415
Where Tagada says
'All of the PD's will now be similar in effectiveness to old Cybran/UEF ones.'
Haven't tested it myself so what's the deal?