I bought this collection of books for my 2 year old son's birthday. Although he's not quite ready to sit for the entire story, they are great, and he carries them around. My 4 year old son loves them, and my 6 year old girl enjoys them as well. We already had the Amazing Airplane book and I had wanted to get more of the series, as I thought it was fun and educational at the same time. I didn't realize there were 10 books until I came across this set. The books in this set are smaller than the regular books but they aren't too small. The truck box that they "stand" in is a little tight and difficult for little fingers, but I wouldn't have cared if the books came with out a holder, so that didn't matter to me. Getting all of the books together was much more economical than buying individual books. I'll be purchasing this set for gifts in the future.