The small format version make it more handy to carry around and more suitable for use by adults. The redesigned cover won't embarrass you in public places.
One can learn the words thanks to the little labelled pictures in the margin, then ignore these, look at the central scene and spot and name the objects in situation. Easy, effective and a good way to utilise spare minutes.
The pronunciation and stress guide provided for each word in the glossary is easy to understand, but the paragraphs giving the general rules of pronunciation and stress are brief and sketchy. I have had to read on that somewhere else.
Definitely not a self-contained teach-yourself method, but a practical accessory for building up basic vocabulary easily.