Product review (5 stars): Almost an exact replacement.
It is almost an exact replacement with the exception of the small box that the water filler hose has to go into.  The original Whirlpool one on my refrigerator was lower in height thereby allowing the hose to slip in, while the new one was substantially higher which would not allow insertion of the hose.  All that I has to do was to separate the end panel and remove the new box and replace it with the original one.  You have to be careful in doing this so the timing of the unit is not disturbed.  After the installation was completed, the icemaker has been popping out perfect cubes in a timely manner.  Could not beat the price!