i bought the system 4 york and installed last dec 2011,i bought in their show room at 586 balestier road.cos is my friend intro me to them so they offer me $2995 for system 4,3x9000 1x18000btu for living area.i think is a good price for a inverter system 4,so far so good for the aircon.and their workmanship not bad,cant find anythings to compliant.