Travelling through Changi nearly twice a month most of the time on my way to Hong Kong or Europe. Even though Changi might be one of the best airports in the world (not T1 which is outdated dark dirty etc. but fortunately gets a makeover and extension now) the better airport in this region is HKG. Changi T2 and T3 are nice efficient clean but its a bit uncomfortable to have the 3 terminals and even though the travel between the Terminals is nice the appearance of the airport is rather cold. With the friendliness of the staff at the check-in its really a hit and miss customs as well but the security at the gate is most of the time friendly and joking. I dont like the military patrols in the airport. One thing is bad the connection to the city by public transport. 5 bus lines only MRT line which is a big hassle as you have to transfer after 2 stations and have to go all the way to the city center before going into your actual direction.