Product review (5 stars): Cure the Achille's Heel!
I was wondering how long the upper rack adjusters would last on my Whirlpool-made, Kenmore dishwasher after comparing them to my mom's older Kenmore DW, which was also made by Whirlpool.  I got my answer last month:  3 years for me.  A littler research online revealed that the breakage of this part is a huge problem.  The Achilles heel of the original part's design is the dainty wheel axles that are part of the plastic mold of the adjuster's bracket.  Over time in the harsh DW environment, these pieces, which have to bear the weight of the dishes in the upper rack, become brittle and eventually break.  It's not a matter of "If it will break" but rather "When".  Shame on Whirlpool for putting such garbage on consumers.

Luckily, I happened upon a video that showed this "upgraded" adjuster kit, which really is very similar if not the same as the adjuster used prior to the one that came in the machine.  There were a few helpful videos that show how to remove the old adjusters and put on the new ones.  It's a rather easy, low-cost fix and anyone can do it without incurring the costs of a repairman.  There is absolutely no reason to buy the original adjusters, which are virtually the same price as this one.  They really need to stop selling the old one so that unwary consumers don't waste money on them.

The dishwasher is back to working as normal.  Actually, it's better than when new, as the upper rack used to squeal like an oiled pig at a county fair from when it was practically new.  The wheels of the new adjuster roll much more smoothly in the tracks without all the racket.  The parts of this adjuster are notably heavier than the original ones, as the brackets are constructed of heavy gauge metal.  My mom's machine is 11 years old and never had any issues, so I believe this new adjuster will last the life of the machine without further complaint.  If I were to have anything negative to say, it's that this adjuster intrudes slightly more into the rack.  So, I have to place smaller glasses next to it than before.  Obviously, this is a minor nit but something I immediately noticed.