These each permit at least some degree of specialisation - in terms of exercise style (eg body weight) or body-part focus.
In each case, they offer a strength that beats the pants off anything else in their class; from the Basic Trainer which is tougher and more stable than anything at twice the price, the Leverage Squat and Calf unit which offers unique muscle targeting, to the Multi Press for-every-angle-and-grip upper-body work, and the Assisted Chin and Dip, which not only offers perfect body weight execution, but is the only one there is for home use. (And it's nicer to use than commercial units)
For a lot of customers these are pure pleasure units for the exercises they enjoy most. They usually also have a multi function rack, or dumbbell or leverage gym for broader training.