Depends on the machine, application, and desired effects. NOTHING compares to free weight squats or deads in the machine world. For some things like upper back work, machines can be more effective for size gains than most free weight moves. Of all those I have seen the Hammer strenght machines give EXCELLENT results, fit most trainees well, and can provide better results for SOME people than free weights. If you powerlift, well you better be hittin' the slag iron!
Iron Addict