I found that it is largely full of code listings, and short on background information. The coding style seems very much stuck in the VB6 world, and the author needs to acquaint himself with the guidelines for coding in .NET (e.g., naming, etc.).At the time I bought this book, it was the only book around for VS.NET add-in development. I did get some value out of it, but now that I've done more development of add-ins and VSIP packages for Visual Studio .NET, I find this book very thin on information, and full of sloppy errors.It might be useful if you are writing VS.NET add ins (but take it with a grain of salt). If you want to develop add-ins, and learn about Visual Studio .NET in general, "Inside Microsoft Visual Studio .NET" is a far better choice.