I personally don't see FF as more convenient. I was too lazy to express milk, and sterilise bottles etc so DS was on the boob all the time. So there's no way I'd find FF easier, with bottles to wash etc. Much quicker to whip out a boob too rather than mix formula and heat it up, especially at night. Can't think of a faster way to get bub (and mum!) back to sleep than sticking em on the boob