Product review (4 stars): A Near Perfect Replacement
This is an official Whirlpool part and not an aftermarket product.  It is a near perfect replacement for the original Kenmore dishwasher we have.  There are two differences, which I see have been noted in other reviews.  The first is that the color is a very light gray as opposed to the white of the original product it is replacing.  However, this is the part number that was recommended by Kenmore to replace the original for my model number.  It's not a deal breaker, unless you are really particular about aesthetics, because you only see the difference in color between the upper and lower dish rack assemblies when the unit is open.

The second difference is that the gauge of the wire used for this part appears to be somewhat thinner than that found in the original.  This is a bit more of a concern with regard to durability, especially with the amount of flex in the wire place holders of the replacement in comparison to the original.  It is probably a cost saving measure for Whirlpool, but I hope that it lasts as long as the 15 years my original disk rack assembly provided.  This difference is what prevented me from giving the product 5 stars.  If durability issues surface, I'll be sure to come back and update my review.

[Update 12/9/15]

After nearly a full year of use no durability issues have surfaced.  Despite the thinner gauge of wire used, we have not experienced and bending or breakage.  The rack looks as good as the day we installed  it.