FreeStyle works for 110-220V, so no voltage problem to use it in HK. However, you need to add a 萬能頭 to change from 2 legs to 3 legs.
I just bought one from MommyGear on Apr 1 and arrive HK yesterday (delayed by HK Easter holiday). I have tried 2 times and this is pretty good. 10 mins for 180ml, which save 50% time by using my previous Swing