Feedback on the HKTA/PCCW card from a happy visitor. Getting 2 cards for a 15 day visit saved a ton, versus previous trips. Good connectivity and sound quality. He recommends them for anyone wanting to make a ton of local calls and have data needs, and would definitely use them again on all future trips.
We found it really hard to track down these cards at 7-11 (despite the ads claiming 7-11 stocks them). If you have visitors coming who want a sim card right after they land, the best place to buy them @ the airport is Nobletime, which is inbetween the A and B exits in T1 arrivals hall. Very helpful staff who'll figure everything out for you.