Suffice it to say that I wouldn't have kept my son there this long if I didn't like the school, if my son doesn't enjoy going to school every day, if I don't feel that he is thriving there. I like the way TT approaches teaching and their curriculum. I like the fact that it is truly bilingual in that all the classes are equally split between English and Mandarin. I also like the fact that his teachers are accessible, answer questions, and readily share regarding his progress in school (on different aspects, not just from an academic standpoint).
--
That said...
While it's good to just keep your child there so that she won't have to adjust to a new environment, you do have to look at it long-term and decide whether or not you think TT is the right school for your child, whether or not you think she'll "thrive" there, whether or not you subscribe to TT's teaching philosophy and curriculum. See if you can request for a peek into a Nursery and even a Kindy class (or ask that you watch a session on the school cam) if you think that would help you get a better feel. Talk to the teachers, ask them questions and try to find out more, if you are not sure.
Good luck.