I've had plenty of bad and occassionally good screeners. A few days ago at DEN, they were very nice. At LGB they are quite belligerent. At non U.S. airports for flights heading to the U.S., they just go through the motions and they are obviously only doing the searches because the FAA told them they have to. At LIM, they made all sorts of announcements, yet the searchers didn't really do much.