All muesli bars are likely to be bad. I struggled to find a sugar free muesli ( and then didn't end up eating it ), so bars for kids without sugar - not likely. I know that other people have talked about things David said and where they found the ingredients were not what he seemed to be saying, my advice is, don't treat the book like the Bible, if David ate something, that doesn't mean you shouldn't check the label, he may have missed something or the ingredients may have changed.
An ice cream maker is lots of fun, you can make really nice ice creams really cheaply and make any flavour you want. I travel to the US four times a year with work and they have lots of flavours that you don't see here ( esp the Ben and Jerries, which you can't get in Tassie ), and we grow berries, too, so in the summer, I make all sorts of weird flavours ( although I don't make it every night, esp now that I'm sugar free, I would agree with the book that a sugary treat IS a treat, not something you eat every day )