Booth - will do, I've tried PCCW previously and it was very solid for both data and calls, their Wifi network is also the best in the city (only useful periodically admittedly). I would still rather have bought 3 (cost was my primary consideration) but the guy at the shop expressly told me that the iPad sim was a Micro SIM and not a normal SIM, so... Usually 7-11 is pretty good for this kind of stuff but all the shops were out (no doubt because they were trying to avoid 3 shop assistants who discourage them from the SIM card).
MovingIn07 - 1) 200mb isn't enough for me, that's a very low amount, and 2) their shop in Sheung Wan was jam packed with mainlanders shouting at each other - that didn't encourage me to stay and wait out the queue LOL.
Medaman - yeah, tell me about it. You clearly can't call on the iPad but the SIM card package also clearly states the cost per minute of voice calls.