I attended FSI on a mx course once with the oldest and most experienced mx instructor in the entire FSI organization. He rattled over the slides of electronics so fast that most of us were barely able to keep up, became upset when asked a question, read from the textbook, and offered zero insight into any subject or system, and didn't deviate one iota. We were his last class, as his replacement was auditing the class with us.
I've found sim instructors at FSI, Simuflite, etc, to be helpful...but the classroom time typically hasn't been worth much to me. For mx courses where there's little or no sim time, that only leaves class. Personally, I see paying someone to read a book to me wasteful, particularly at the prices charged for story time.
My favorite responses to questions have come from FSI, where I'm really sick to death of hearing the overuse of "It's PFM!" when asked regarding a system or component. Pure magic. What an intelligent, well thought out response. And well worth the forteen, thirty, or forty five thousand dollars...