I have not nor have I known anyone who has. But, it depends on how good of a player you already are, and what type of game you play. Different schools will coach different ways.
Do you play live or online? If online then I wouldnt goto a school because they are really only good for live play teachings, online teachings you would fair much better reading books (especially Let There Be Range, which I can get you a digital copy of).
If you want to play live and are already a good player, then I suggest taking a psychology course in human behavior or a course in learning about micro-expressions and what not. Live tells
are the only real way to have great success at live poker, because there are so many players out there with close to equal game skills everywhere, its the only way to consistently win.