Drentel - You're right, the machines do look a bit awkward at first sight. As the saying goes, looks can be deceiving. What I like most about the machine is that it is low impact. I can stay on it for an hour and not have any pain in my joints.
Many people think that a walking exercise is not going to be very intense, but, as you found out, the movements of the health walker and health walker plus machines provide a great workout for the muscles of the arms and legs.