My baby, my husband and I are a fan of this collection since its 5 months. It is his 'toy' favorite. At 7 months now he understood where to press to play the songs. At home it was almost the entire collection but we prefer everything song as audio clips are much longer (than animal sounds for example) and my baby (like most I think) adoooore music. The first tones it topples forward, applauds etc. We only had one problem with a book, a sound passed away after a few months. The value is for me great: we spent hours and hours leafing this book. The batteries hold well: after about 5 months of fairly intensive use I had to change. These books are ideal for quiet moments with turbulent babies. Even now he travels with his trotter (11 months) he still loves these little down time on Mom's lap.