Changi is one of the most efficient airports I have been to. Unless you are the sort of person who believes in going to the airport 3 hours before departure or are waiting for a connecting flight - I don't think you will have a chance to sit at the airport and use your laptop. Check-in, immigration clearance, security checks, taxi queues...everything is handled so quickly and efficiently!, But for those who are fond of hanging around at airports - excellent wireless connectivity, powerpoints available. And hey there is a even a pool table next to the food court!