When i buy a horse, i have the type of rider im buying it for try it out.. then i dont have any problem about not knowing what what im getting. If im looking for more of a beginner i get on the horse first to make sure that i feel its safe for the other person to ride. Really when your buying horses, you can't expect the seller to disclose everything, and you have to realize, your version of trained might not be the same as the sellers version. THe only thing i think you could really get angry over is the horse having medical conditions.