Exoskeleton Helps the Paralysed Walk
The wearer switches between "modes" with a tap on a wrist-pad, then controls the actual motion by shifting their upper body-weight. For instance, they would hit "stand", then lean forward to make the ReWalk straighten its exo-legs.
The device is much more streamlined than some other systems, run from a very flat pack-pack, and can be worn all day, but is only suitable for paralysis victims who still have good control of their arms and shoulders.
ReWalk seems much simpler and lighter than other exoskeletons, but that seems to be because the designers have not tried to replace the entire walking function - balance is still down to the wearer, using crutches, but I imagine practice could reduce that to sticks, or even a single stick.
Weight and fitness seem to be factors as well - the man in the video is was an Israeli paratrooper, injured on duty, and there are no shots of the rather portly wheel-chair-bound inventor wearing the ReWalk, but I think you'll agree it would still be a major benefit to an awful lot of people.
This video is in German, but shows more shots of the exoskeleton, and has clips of the designer discussing his project.