We bought a one year subscription for a friend who had their first child. After the first four months, I thought that they probably had enough toddler age books, and that maybe they should have a few months of the next reading level. I emailed them, and Daniel responded so quickly and said that we could absolutely do that! I was so happy! The next set of books arrived and were the next reading level.
My friend and her husband love this gift, and honestly it is probably the gift I have enjoyed giving the most.
The company is responsive, polite and helpful. I wish this had been around when my kids were little. It's been a great experience.