Product review (5 stars): Very easy install, seems much sturdier than the terrible original design
Three of the four rollers on my original Kenmore rack broke off simultaneously causing the top rack to crash down fully loaded with dishes. My 2 year old was helping me unload spoons from the bottom rack when this happened and luckily she didn't get hurt.  Kenmore should have send this kit out as a recall replacement to all owners of the original flawed system.  But I am glad the replacement kit looks much sturdier.  It took me about 5 minutes to install the first adjustor (I recommend doing them one side at a time so you have the old adjustor still in place as a guide for placement).  The second took less than 2 minutes including removal of the old adjustor (I timed myself).  Very simple to install.  A lot of people complained about the instructions, but I didn't think they were that bad.  I didn't bother looking up anything on youtube because it was fairly straightforward.  And while a T15 torx bit is recommended for the easiest installation, they did include an T15 torx-to-phillips head adapter in my bag of parts so no special tools are required.