One other piece of advice if you want to save a few pesos--and sometimes save some time. I've had to wait quite a while waiting for them to process payment and get the vehicle.

Walk up to the departures level and grab a metered taxi that is dropping someone off. I've taken the arrivals level and it is a set amount (I think it was 440 to Makati). A metered cab is about 100 pesos--just make sure the driver turns on the meter.