I took the time to look through the preview of the book, and there are some VERY nice pictures. And your partner did a very good job with the layout and writing. All in all a product you can be proud of, and hopefully it will sell well.
The bad news of course is that folks are going to think the great photos are the result of all that expensive equipment. But of course it is not the equipment, it is the skill, ingenuity and tenacity of the guy behind the expensive equipment, combined with the willingness to wade through hundreds of photos and find the gems. Which you did well.
Congrats.
JBWX