I am a big fan of the ellipticle machine because it is the perfect center between a flat walker and the stair climber.

You get all the benefits of the stair climber with less impact to your knees.

The flat walker is for injured, someone with bad knees, out of shape, elderly.

The ellipticle burns more calories and improves cardio vascular function, and shapes your legs and butt.

The stair climber is a better butt machine, but harder on your knees.

I vote the ellipticle the best well rounded cardio machine for the average person.