I think that the loss of F seats is prefereble when talking about adding E+, imho. Even as a plat, I am not expecting to be UG'd with the same frequency on UA as I was on CO, so I would like to have E+ as the bare minimum that I can expect. Legroom is #'s 1,2, and 3 in my book, so I am excited about possibly having this feature on the old CO planes soon...