When I was a young reader, this book and its sequels were one of the first I picked up. I loved the animated series and jumped right into the novels. If you've seen the series you will notice several differences, most notably the gender changes of some of the characters; in the book the main cast is almost exclusively male, and the series balanced things out a bit. The sequels were treated very differently on television, but the original series treats the novel with the care and grace it deserves.
The writing is difficult to review not because of flaws or unusual style, but because of its simplicity. Dann works hard to maintain a perfect clarity throughout, in terms of the well-constructed characters and the simple yet thoroughly engaging plot. It's an easy read and one the kids will truly adore, and is a wonderfully nostalgic read for myself and many others. If you are an adult and unfamiliar with the series though, you may not find the substance you were looking for in this first book, but you will most likely enjoy the next few instalments in the series.
Concisely planned and well thought out.