Product review (1 stars): I just now ordered my 3rd set of these for ...
I just now ordered my 3rd set of these for my Kenmore Elite dishwasher.  I've had the dishwasher since January of 2011, so that's an average of 1 replacement per little more than a year.  Luckily I have an extended warranty on the dishwasher thru early 2016, so so far the parts replacements have cost me nothing but time and inconvenience.  Nonetheless, the quality and longevity of this part is very disappointing.
In my case, each time the prongs that hold the wheels in place have snapped off, which makes the top rack sag.  I am careful about not putting heavy things in the top rack; still, the plastic prongs break.