I took a trial class in Mutard Seed with my son, that is very good playgroup, providing good environment playground for kids and well organize during the lessons.
Even though, my son now join the playgroup in Baby Buddies and St. James, compare with them, Mustard Seed is the good one.
But only one concerning on the language, mustard seed not really good in language, speaking in English and Cantonese on the same time, I really don't like that to teach the kid. I prefer English.. or all cantonese.. don't mix together.