I'd say PASS, but get a list of questions on internals that you want to learn more about. Have a notepad, and ask a few of the experts or MS people those questions and get answers. I think you'll get enough information (and contacts) to learn more on your own.

Plus you'll be exposed to more than just that at PASS. You can also look at the pre-post cons, which are great one day classes.

Also, don't forget the SSC3D code and come to our party 😉