Rating: 

For the (aspiring) COM user this is a good book. It really lets you see why and how at the user level. It isn't very deep when talking about custom COM though. Standard COM is thoroughly covered.

For those of us who want to use COM at the grassroots C++ level, this is a book to have. People who want to use COM in other languages - it's so easy you don't need a book!

Mr. Thuan L. Thai, you are one verbose man. I like your desire to explain. You have this attention to detail. Just don't repeat yourself three times everywhere. It looks like you wrote the book in a very modular way. Very component like! Each module begins with a topic statement, then discusses the topic, and then cleans up. That's fine, but when you don't develop these modules in order, yet put them all together like a big jigsaw puzzle, well, you know what comes out. It works when you're programming, but it's disturbing in prose. I know, because after reading your book, I'm really disturbed.