roll takes 25 energy, and they can go 24m on a full bar, 48m if they have their probe up (whatever it is called that refills their energy). Spamming roll will get them moving much faster than any other speed boost out there.
The problem is they move so fast out of range (I have had them outdistance me even with me using force speed, and still out of range) that being able to CC or stun them is extremely difficult.
Chances are they will roll past a teammate who will probably stun/snare/push/knowckback/pull them.
I haven't had much trouble with them really.