I would advise it. Coming from the UK they use huge long haul planes with 350 people and then it's onto the coaches which they obviously make sure that they put just enough on so they fill each one (40 persons). There is always someone who gets stuck at customs or gets lost that you end up waiting for. When we used to fly from the UK 3 times a year, once we learned we always booked private transport. We'd check in with no queue, get the best pick of the rooms available, be showered and changed and on our second drink as the other people on our flight queued to check in an hour and a half later.