Product review (5 stars): but it is noticeably better designed than the original
Hooray!  Within a few months of having this dishwasher, the wheel hub on the top rack broke (because it's plastic).  Luckily, we were in warranty and we had the part replaced.  The tech ordered a few of them and left them with us.  Fast forward almost 2 years and we've burned through all of the parts we got when the dishwasher was in warranty.  We were living with the top rack being broken and hating every load.

Then, one dreary day, I was fed up and did some googling for another part.  Huzzah!  They had redesigned the part ...and in METAL! While I do agree with one reviewer that wished Whirlpool had sent this free to all owners, they could have charged twice the price and I still would have paid it. At around $40, it is $ well spent to finally rid ourselves of the "top rack of doom."

I can honestly state that this part has solved our problem.  Only time will tell if it will last long-term, but it is noticeably better designed than the original.  One less daily annoyance off my list.