As always different trainers and gyms swear by one piece of equipment or another as the end all be all of training. Each week its a new tool, not technique or method, that is the only way to to complete conditioning. The video below is a little extreme, but it proves my point that you need to worry about your ultimate goals and produce a training philosophy around those goals, not worry about the tools that you are going to use to implement that philosophy. In this video, they use no traditional gym equipment, but I think you will agree they are pretty well rounded on all aspects of their fitness. Philosophy/Method not the tools!