Though I don't have any experience in using Honey Tree, I recently heard positive things about it while researching daycare options for my infant son. A "friend of a friend" had her daughter attend Honey Tree from infancy to age 5 and was very happy with the experience. For a brief period prior to Honey Tree, she also had her daughter at Corporate Childcare Consultants (another infant daycare in the Loop at 219 S. Dearborn) and felt that Honey Tree was far more organized, cleaner, and overall a better environment for her child.
Also, I know that there's a website, www.northsideparents.org that has some feedback from parents on various daycare centers in the city, including Honey Tree. You have to pay a membership fee to join the network first in order to access the info, but it may be worth it.
Hope this helps.