Where I go to train choke, prawn and other collars like that are forbidden in all classes. They prefer instead that the dogs have flat nylon buckle collars, and use only positive reinforcement. They work with the owner and dog until they find something that motivates the dog to work. For some it's food, others toys and others it's just a willingness to please.
Thats what I would like, a class like that, Jasper does have a willingness to please, hes already learned sit, lay down, stay, and give both paws in about one month