So you are saying that the experiences of others probably wouldn't apply to me?
That is the same thing as saying that my experiences on Spirit wouldn't translate into advice that "others" could probably use the overhead storage on Spirit without trouble.
I never ask permission, I just put it up there when I get to my seat.
Have they done the same when traveling on Frontier?
I guess I don't understand why you even posted in my thread if you don't have a personal experience with putting a free personal item in the overhead on Frontier.