I've been to Rome so many times, and except for the 70s, I've always taken the train, or taxi or my own car/rental/taxi to get to FCO. What always scared me with the idea of the bus was the time it would take from entering Rome proper till Termini and then reaching my end point. Since a few years my favourite hotel is in the Triestino, and the Metropolitana now goes all the way from Piramide to the Annibaliano, just 150 metres away from the hotel. So, thank you "coloncapitalDexclamationpoint" (only way to write your "name" without it becoming an emoticon ) for the idea which never occurred to me, I'll use this way of getting to Rome on my next trip.