This series is perfect for the intermediate-advanced reader. As beginners, we started with the Pobre Ana books by Blaine Ray. After reading those 11 books, these are a great next step. They are a little "dark" depending upon the ages of your kids, but are fine for adults. After the Blaine Ray books, my kids read through La Casa del Arbol (Magic Treehouse) series…. it is hard to find great books for learning Spanish but these are pretty good. The Leer y Aprender books are okay, but have quite a lot of older Spanish or more Spain-Spanish, which for us was not good since we are in South America. The Leer En Español books are great and reasonably interesting and well written for adults. Highly recommend!