Pros
NORY is doing something amazing and innovative for the Early Childhood Education in New York City, and these guys are focused on providing best experiences for children, educators, and institutions that work with them. To this end they can be demanding and exact, and as an early start-up there is endless amount of work to be done and always some fire to be put out. But they make it a pleasure and rewarding to go through all that with them. I also learned a lot about working in start-up company - if you wondered what "working in fast-paced environment and requiring creative problem-solving skills" means, you'll learn it here.
Cons
It's an early stage start-up so all the typical pros and cons of that apply here. They'll also ask you to go runnings with them. Feel free to say no.