One of the main reasons I choose to fly in F is so that I can have a bit of a nap. Often I've just connected from a flight from Europe in Y and really appreciate the ability to go F on the second leg of my flight. I believe that a major perk of F is to be able to have recline your seat in such a way that makes sleeping possible. However I usually end up feeling guilty about upsetting whomever is sitting behind me so I sit there half-reclined. Then, once the person in front of me does a swift full recline, I slowly realise that I have a totally justifyable right to bring my seat to full recline. I'd like to say that my F class boarding pass gives me that right but the last thing I want is to get embroiled in an argument way up there in the sky.