As Thai food becomes increasingly popular in the US (and abroad), hundreds of Thai cookbooks have hit the market, and it's difficult for those interested in cooking Thai food to know what to look for. So let me tell you what you'll get with Delightful Thai Cooking:
In short, you get a small paperback cookbook with a collection of hit-and-miss recipes.
I have been cooking Thai food at home for over 10 years now, and Delightful Thai Cooking is one of the 10 or so Thai cookbooks I own. It was actually the second I ever purchased, and I've cooked a number of recipes from its pages.
*Some of the recipes in Delightful Thai Cooking are quite good; a few are excellent. Most, however, are lacking in various regards when cooked straight according to the recipe, and require substantial revision to get where you'd want them. Some dishes seem to be too strongly flavoured, others not strongly enough, etc. And there are even a few small errors in a couple of recipes which could trip up new cooks.
*It contains no photos (apart from the cover), and very few helpful illustrations (though the illustrations, where present, are much appreciated). If you need photos, this is not the book for you.
*As I am not Thai, I cannot be 100% of how authentic any book is, but I have never seen another Thai cookbook which recommended some of the American shortcuts found in this cookbook: I seriously doubt that using ketchup and peanut butter (as opposed to home-ground peanuts) are particularly "authentic" Thai ingredients. If I were to hazard a guess, I'd guess that some of the recipes in Delightful Thai Cooking are authentic, and some are quite Americanized.
*All of the curries (as far as I recall) expect you to make your own curry paste. If you would rather just buy canned (or bottled) curry paste at the grocery store to save yourself time, the recipes in this book may taste "off".
On the positive side, most of the recipes are moderately easy to prepare.
If you happen to own the book, the Coconut Custard recipe in its dessert section is one of the few that really stand out (I'd be happy to share a few others if anyone cares to inquire).
Overall, however, I cannot recommend Delightful Thai Cooking when there are so many other quite excellent Thai cookbooks available.
If you are looking for a Thai cookbook, I suggest the following:
For absolute beginners, I recommend Simply Thai Cooking.
For those who prefer to see photos of every single dish in a book and want to try something a little more authentic, Thailand: The Beautiful Cookbook is a personal favorite.
If you'd like something very authentic, True Thai or Thai Food are both good books with delicious recipes.
I notice that most of those posting positive reviews of this cookbook have taken courses from (or otherwise know) the author. Perhaps, when combined with a course where the author can teach you how to prepare the dishes in person, many of the recipes in this book may be excellent (assuming one does things the author has taught them which are not written in the pages of the cookbook). Unfortunately, this has not at all been my own experience when trying to prepare the recipes on my own.