But if you've decided to learn the real *language* of Sign, DON'T get this book. Again, deaf adults don't use it. Many signs are similar, but MANY are not used at all in ASL. This is strictly an English-based book -- not something a serious student who wants to speak with adults in Sign would use.
It all depends on why you're learning and who you're planning on conversing with. Children in elementary school? Get this book. You won't be disappointed. Anyone else? Click on the back arrow key and continue your search. That's just this deafie's opinion. :v)