Product review (5 stars): This item "by whirlpool", sold and shipped by Amazon ...
This item "by whirlpool", sold and shipped by Amazon works perfectly.  The product I ordered arrived in a box with a Whirlpool label, so it appears to be manufactured for/by Whirlpool.  It took just a few hours to begin making ice.

Installation difficulty appears to be different across different model fridges.  In my case with a Sears fridge, the ice maker mounts across the back of the fridge and I had some problems releasing the electrical connector.  Once I removed the metal shield where the ice maker mounts, it gave me more room to maneuver the ice maker to gain easier access to the connector and was a breeze.

I don't know why some people leaving reviews claim to receive off brand ice makers rather than the Whirlpool labeled one I receive, unless the reviews are mixed with other models.  The model I received and am reviewing is listed as "by Whirlpool" and "Ships from and sold by Amazon.com."