Looking at the investment world, most hedge fund and mutual fund managers could point to index-crushing returns if the crystal-clear notion of hindsight were an input.
Since the book is a key reason my kids were able to go to the colleges of their choices, the moral seems clear to me: Get as much input from your customers as you can and act on it.
Take the outfit's 40Hz to 20KHz BeatClear speaker, which packs 350mV amp input sensitivity, two tweeters and a pair of woofers inside a clear acrylic case.