It was our first visit in New York, and this guide helped a lot in getting around. Everything you need, from main attractions to tips for the best available ticket prices, is there. The layout is a little tricky to get used to. If you have experience using Rough guides, then you will love it. If it's your first guide of this series, then you might find it a little difficult at first. I always like to read the top suggestions of restaurants, bars etc. and this guide was a good but not great choice. It suggested several from everything, but I had the impression it was the favorites of the authors and not the best for a visitor.
All in all, standard quality for a "regular" visitor. Good information about every sight, a lot of useful tips and well written.
It comes at a convenient size (in my opinion, maybe a bit bigger than it should be).
Go for it and you won't be disappointed.