Jumping in here too. TMO has been working great for me, but I have noticed that I had to set the carrier manually on my iPhone. I had better luck with 3 (specifically the 3 (3G) listing) rather than CTM. This is for Macau. In HK, leaving it on automatic worked fine.

While technically TMO says that the speeds that you get are 2G, it seemed quicker than that. And certainly good enough to make FaceTime audio calls for free.