All those systems/methods -- Caruso, Pivot, Stamp, BE all have a their place. Trumpet playing is to a certain extent an athletic activity and it certainly couldn't hurt to cultivate the training and developing the muscles and nerves that are used in trumpet playing. That being said there are certain things to watch for. 1) It makes little sense to get iron chops if you can't use them to make music 2) Embouchures are personal things, like underwear. These methods are not all the same and the one you choose may not be the one that works for you. Flexibility and pragmatism should be high priorities 3) Most of these methods are attempts at crystallizing the wisdom and experience of great teachers. Its impossible to capture such skills in a book/DVD/video so be aware that you may think you are doing everything according to the book and yet be miles away from what Caruso, Reinhardt, Stevens etc intended. You really shouldn't mess with embouchure issues without a knowledgeable teacher.