I've had my copy for about a week now. Absolutely excellent! I purchased my D90 11 months ago and have been on the eye-out for a comprehensive book in this format ever since (with no luck until this now). Very well written, detailed descriptions and (my favorite) author opinions on nearly every setting based on user knowledge. I have learned as much about using my D90 from this book in the past week as I have in the past year without it!