I don't have direct experience of those particular schools, but I have experience of schs like them and it's worth bearing in mind a few things, and having a few questions to ask them at the school-
a). Are the teachers qualified? And if so where did they qualify and what are they qualified for?
A lot of these so called international kindergartens hire people purely because they are caucasion and have english as a first language.
Ask if their teachers are registered with the EMB (the local HK education department), by law all teachers should be but not all are, mainly because a lot of teachers in these kindergartens wouldn't pass the registration proceedure.
The teachers may have a degree, for example, but it may not be in education or teaching.
2). What curriculum do they follow, and from where? A lot of these kindergartens make up their own curriculums, or the teachers make them up month to month, term to term. All curriculums need to be tweaked with to suit local children etc. but they should follow a govt. approved curriculum- be it from England, Australia, USA etc.
- It's also worth nothing that a lot of these kindergartens are run as businesses, that's not say they don't have the children's best interests at heart, but they are still run for profit.
Personally I wouldn't send my son to any of the kindergartens in TC, but that's my personal opinion.