How do you ever complete a mission with three or more of these things?
Usually, one of these things crosses over a rooftop and strafes my squad at the end of round one - and then gets another couple of reaction shots in. I've had four seasoned warriors killed before any of them's had a chance to shoot back.
I know one good shot from a plasma rifle takes them down but it's a miracle if my soldiers live long enough to take it out, considering they sit around like idiots waiting to be killed instead of using their reaction times. With three of these things appearing in buildings and on rooftops it's almost impossible.