I've only once in I don't know how many flights had anything close to an issue. I always tell the screeners what it is beforehand in case they've never seen a rig before and the most they've ever wanted to do is swab the outside of it. I do tie my handles with pullup cords and have the covers from the RigSleeve on as well,
The two funniest things that have happened doing so were on the same flight. I was on the exit row of a puddlejumper from Monterey to Phoenix, and literally had to buckle the rig into the seat beside me as it would not fit in the tiny bin on the plane. Someone passing chuckled recognizing what it was and said, "Nervous flyer?". Then someone else, do a degree I couldn't entirely assess, was unnerved by the "REMOVE BEFORE FLIGHT" warning on it, I just told them, "Not this kind of flight".