I've been using the book and cassette for just 30 minutes a day for the past fortnight and I have learnt so much, it's unbelievable. My pronunciation in Spanish is better than my French and I've had classroom teaching in French for 2 years. You can work at your own pace. The only thing is that I find the book a little confusing giving various interpretations for Spain, South Spain and Latin America. I can't always remember them all. Otherwise, excellent stuff!