I usually think that if I can learn just two applicable things from a business book, then it's been a worthwhile read. I liked the idea presented here, keep things as simple as they can be, so I guess that's one thing to remember. The other is not to attend meetings unless you're sure why you're going and what you expect to get out of them. Given that attending meetings has become an everyday occurrance (passtime?) for managers, turning down a few might be a good idea!
The style is somewhat disjointed, however, and I don't think the layout is all that simple in itself. One of the concepts, the dancecard, which suggests you almost itemize and prioritise your whole day ahead may be a simple enough concept, but how simple will it be to apply on a day-to-day basis? You may also feel that you've read many of the principles in this book before, and you probably have, but this book has the saving grace of being rather short and snappy where many similar texts are not. This latter fact meant that I finished Simply Brilliant, and I don't finish many such books! I also came away with my two applicable ideas, so I can't complain really.