Product review (3 stars): Disappointed to say the least
Cons:
I expected far better from Whirlpool and after the brackets holding the plastic wheels broke on the top shelf 4 times I have resorted to a far cheaper and more practical fix.  Instead of contacting Whirlpool to send yet another replacement bracket and telling them the machine is defective, I went to the hardware store and bought 2 brass 1/4" flat head bolts with washers and drilled out the plastic to just smaller than the bolt size.  Gently screwed in with the roller affixed so "play" stays consistent to the original.  My wife is again happy that we can use the top shelf of this 2 year old unit.  Shame on you Whirlpool.  Cost: $1.50
If this doesn't hold up over the long term, I have the nuts that I will tighten on the end of the screw.
The washer itself washes only so-so and seems to eat the "jetdry" when filled so we only add a little at a time as without this, the mashine's wash is less then good.
Pros: Quiet and looks nice