Advice regarding air-port housing society sector-4

Hello...
Is air-port housing society sector 4 legal/illegal (access from gulzar-e-quaid)... Whats the advice by property gurus on buying a 5 marla house in air-port society for living purposes?
Please also guide regarding how much cost should be of 5 marla house there!
What are the real life day-to-day issues faced by residents of sector-4! What about electricity, gas, water, telephone, garbage collection, and other issues.