Product review (5 stars): Finally, I can appreciate my dishwasher again!
After continuously replacing the old plastic parts with new plastic parts multiple times over 5 years (at like $80 a set), I was SO HAPPY to find that Whirlpool/Kitchenaid finally came out with a more durable design for the top rack of the dishwasher.  I know they were taking a big hit from consumers on product reviews for their dishwashers because of the original design of the rack roller contraptions.  Knock on wood, maybe now we can stop cursing the day when we bought this dishwasher!  For instructions on how to install, search youtube for W10712394 and you'll find a couple of really good videos.  It only took about 5 minutes to replace them.