I have this book and although I haven't knit anything using it, I've read through it.
IMO, the sweaters in the book are the big boxy kind (think 80s). If you prefer sleek fitted sweaters you may have to re-work the math a bit. Add some shaping and measure correctly and choose size correctly.
I still think this book is invaluable though. I have no problem with numbers and a little re-work is fine with me. But this book tells you about all kinds of construction styles and combined with the Vogue Stitchionary and Knitting on the Edge books you'll have tons of ideas to choose from