From a former Flight Attendant, it's rude to use the button. I agree if you want something on a long flight get up and get it. For one it's hard to find the exact spot the button came from. You really can't see the little light when ur walking through the plane. Second most of the time someone rings it, it's for something dumb. Like a pillow or a blanket. Either grab one when you first get on the plane, get up and get it yourself, or trying bringing ur own (those things are nasty, the blankets are just folded up and thrown back up there for the next flight, and the pillows as well. The FA's have enough to do. Remember, their primary function is safety. And also that they are human too, and they need to eat, sit down and take a break, have time to use the lav. So once again, just get up and go ask.