Looking at the other reviews on here, and I'm clearly in the minority: Hill's book is well organized, useful, and probably decent for beginners. I picked it up as I wanted to dive back deeper into learning/practicing Italian, and I'm disappointed to say it's the least effective method I have. In fact, I found myself more than once questioning if it were teaching the language correctly, or just quickly.
However, it also promotes a style I'm not sure I agree with: teaching broken Italian and skimming over details for the sake of being able to speak it. Maybe later volumes go into more details, but this one misses the future tense entirely, is grammatically over-reliant (incorrectly so) on "di" as the Italian preposition of choice, and teaches conjugations in a seemingly random order (this is to say nothing of over-reliance upon cognates, ignoring the subjunctive entirely which is a huge part of Italian, and syntax). I suspect that's by design, but anyone looking to learn Italian from this should ask themselves if they'd rather quickly learn a broken way to speak the language, or more slowly learn the correct way to speak it.
With this book, I do think a beginner would be able to hold their own in a very on-rails conversation that doesn't deviate from the basic phrases learned, but I cannot imagine that actually holding a conversation, shifting verb tenses, and understanding grammar/composition would be anywhere near functional for even a simple Italian conversation.
In which case: what's the point?