My friend introduced me to this series when I was in Jr High. Back then there was only this book. As the different books in the series came out I bought them and then they became traveling books.
I just got my "Forever in Blue" book back after a year and half of traveling around. My friends and I were about the same age as the girls in the books each time was released, if that makes sense. And the books gave us another thing in common as each of us went our seperate ways, marriage, college, etc.
These books made me laugh, cry, and even through the book across the room sometimes.