My girl joined when she is K2. She said it's very boring. She told me the teacher taught them to sing songs and do some art & craft.
I thinks there may be over 20 children in a class or even much more. The bad experience was we joined the sports day held by "Funxxxd Kindergarten with Girl Guide", the arrangement was really bad. I met a friend who is currently teaching in that kindergarten and said not much "Funxxx Kindergarten" student join that kind of activity because of the bad arrangement.
The only good thing I can say is the fee is really cheap.
i also want to let my son join " Little Bee" as it set the age at 4.
however, if it is not worth to join, i wait him to be 5 yrs old and join "Little grasshopper" (boy scout) instead.