Not having EVER been near one, and only seen one or two, from what I understand the AW-139 is not all to happy about the cold, and also, someone who did not know jack-all about flying decided to design a medical interior of the helicopter, and made it so dang heavy and large they can't operate properly with it...
But as I said, I have never been in/on/near one so who knows.
Apparently they don't like back-talking tho!
Cheers
W.