I will strongly recommend Stimulus. My daughter is going there.. and we are completely satisfied with her growth.
Their infrastructure is good, large airy rooms... good outdoor space (some of Noida's preschool do not have outdoor space at all).. my kid enjoys the playstation there.
They take proper care of the child, are patient and work very hard towards a kid. I have seen huge difference in my kid in last 4 months.
all n all, a nice school and absolutely no need to be hesitant that its a newly opened school (this was my primary concern)