Great info in this thread!
I will comment on one thing that is mentioned in the original thread: It says that FP+ is not technically transferable, but that in practice it can be done.
Here was my experience with that:
My group got our 5th FP of the day for Barnstormer (4 total FPs). There was a line, so FP did save some (but not much) time. The first time, my older daughter rode with her dad. But our three year old fell asleep in her stroller and we did not want to wake her up to ride, so I told my older daughter to go ahead and use my Magic Band and she could ride again while I sat with the little one. I was going to let her use my little one's Magic Band, also, since she was asleep and could not use it. DD went to the line and the CM told her that she remembered her from before and she was not allowed to use someone else's Magic Band, but she would allow her to go just one more time (so no one ever used our 4th Barnstormer FP).
So at least some CMs will try to prevent people from using other people's bands to use FPs. I did not feel that we were trying to cheat. We legitimately had 4 FPs for Barnstormer and I voluntarily gave up my ride for my daughter to have an extra one. It would not have made a big difference to other people either way.
I am not sure how CMs are trained to handle this, but I now know that some CMs don't like it.