Hello fellow XNA Programmer!
I have a problem. In the section in Chapter 4 where, you venture to find out the difference in performance of the DrawUserPrimitives and DrawPrimitives methods, you found nothing. However, I found one important thing. While the performance between the two version may have not been altered, the display was: the DrawIndexedPrimitives method showed nothing at all!
So now what? I've checked my programming, and the errata, and have done everything right. Have I missed a post where this was covered?