Instruct: Classify Amazon reviews into positive or negative sentiment
Query: So easy, so perfect!

My husband is a sales manager and a diabetic. He frequently takes clients out to lunch or dinner, so he needed something small and discreet for the road, yet comprehensive enough to contain a wide variety of foods to count his carbs for insulin shots. He's been using it a few weeks now and not once has a food item not been there! It's really helped him stay in control. With the layout of the book it would be great for anyone watching what they're eating.