Product review (4 stars): Easy installation, the metal roller assembly seems better than the all plastic alternatives
Purchased on an appliance warehouse but should have purchased on Amazon, it would have been $8 cheaper.

Replaced existing all plastic rack adjusters that have failed every 12-18 months. The first time we spent $180 for an appliance repair guy to do it. It looked easy enough, so I thought I'd try it myself. The installation was really easy. The key points are getting the guides aligned (rotate them to get in place) and getting the thumb adjusters aligned. And you definitely need the torx driver. The instructions are complete, but the photos were dark and hard to see details. YouTube videos really show all the tricks. Total install time (after watching a video) was about 20 minutes, including removal of the old adjusters.

Now we'll see how long these last. As another reviewer commented, while the roller assembly is now metal there is still a lot of plastic. I think if you raise and lower the rack a lot the height adjuster mechanism, which is all plastic, could fail.