I found the colour coded sections very easy to navigate. I travelled for two months in South America and found that by and large the menu items were in the food and drink section, and usually a word or similar word could be found in the dictionary. The regional variations are helpful, for example a bus station could be 'estacion de Autobuses ', or 'terminal de omnibuses', depending on where you are.
I never really used the front grammar section, and there's no past or future tenses, but it's amazing how much Spanish you pick up from it. Small, discreet and fast to access once you know the sections, I would highly recommend this book. A Spanish CD course before I left helps with pronounciation pitfalls, but generally the phonetic spelling is spot on.