Rich,
I really couldn't tell any difference in touchscreen sensitivity. Like I said, I had some difficulty with the rubber-band dragging, but I had never tried it before. I was unaware that you're only supposed to briefly touch the course line before beginning the drag. I think I was touching too long and that would generate an option dialog for the location I touched. When all else fails, read the directions! HA!
All the buttons, panning the map, etc., seemed to work just the same with the protector in place.
Like most things computer and touchscreen related, I really should play with it more on the ground and not in-flight to be sure I've gotten the "hang" of it!
John
N750A