Or a decent solution to the fixed linear motion of the smith machine, for the home and someone who doesnt have a spotter?
http://www.sportsauthority.com/sm-golds-gym-power-series-power-axis--pi-2169716.html
Another case of someone trying to build a better mouse trap. Its pretty but it aint better and wont be. Get a power rack set the pins at height and lift.
I see what you mean. For the space it takes up, a regular rack with the ability to do chins and a high/low pulley if one desires, would provide more. It seemed pretty clever but one of those too clever by half things.