Save your money. You wouldn't learn a thing in class. Guys who go in knowing it all never do.
Did I say I know it all? Or did I ask a question of folks who have attended the actual courses? Maybe you will answer this question. If you already knew and practiced using much of the same curriculum as was being taught at say school X is there a benefit enough to warrant the expense? If yes please list what if you would be so kind.
For the record Pax I am a sponge when it comes to learning something new and improved. Your assumption wasn't really cool.