Conversely, I didn't have a great Host Program experience. My host didn't have class the specified day, and I received the assignment too late to find someone who did. However, my host did put me in contact with another host and piggybacked to the class of my choice.
Nevertheless, I came away loving Columbia and would probably apply ED if I had to do it all over again (knocking on wood that I don't!). I feel like there is a great balance between being a great university and being in New York.