Product review (5 stars): Sturdier than the original.  A good deal.
As other reviews have said, these parts are what the original dishwasher should have come with.  The metal rails and roller design is much more robust and in keeping with the quality of the rest of the unit.  Installation was a snap (literally), once you get your orientation right.  The pictures in the instructions could have been a little lighter for seeing the details of orientation.  The price was lower than on the Sears parts site.  My only complaint is that the bracket that wraps the up/down slider takes up a little more room in the rack, but it's not worth docking points.  Definitely 5 stars.