Product review (1 stars): NO WHERE ON HERE WAS IT MENTIONED SO I AM DOING IT NOW FOR THE SAKE OF OTHERS TO BE AWARE
Update Feb 20 2017. LESS THAN ONE MONTH LATER...

The manifold tube (that inserts to the back wall water feed) that attaches to the sprayer arm was too short by a couple of millimeters and caused a slight tapping at first.  I thought no big deal, it will eventually settle into place and because it was moving freely for the most part, it would be fine.  (I did think about filing it down a little, but it would compromise the seal in the seams. So I didn't). Well after a few weeks of sanitary heated cycles - the sprayer arm gets stuck right at that spot.  No longer feeely moving and not washing the items in the top rack.  I've checked the pump, the drain, etc.  everything is working fine.  But the sprayer arm is not moving beyond that spot where it catches on the manifold.  Frustrating was not the colloquial word that I used while trying to understand why this is happening.  The cheap plastic and the heat do not mix and what was a "little off" that only caused a little tapping is now completely stopping the movement.  Ugh. Returning it now.

Just got it today.  At first I was happy to see that the piece was sealed around its edges along the spray arm.  That is where there was separation on the old arm and I finally figured out that it was the culprit for the leaking.  So that was good.
Here are my "buts"... the new spray arm was full of jagged plastic molding.  I looked and thought it was old caulking-but it wasn't.  It was the poor removal from the mold.
Then I replaced the old spray arm and its feeder tube.  My whirlpool is the old quiet partner II (about 8yrs old) So it had the insert attachment at the end that goes into the back wall water feed.  What I had to do AND NO WHERE ON HERE WAS IT MENTIONED SO I AM DOING IT NOW FOR THE SAKE OF OTHERS TO BE AWARE...  you'll need to keep that insert and put it into the new tube in order to get the water directly into that arm.  Otherwise the new arm WILL NOT WORK AT ALL.  So somewhere in the description there should have been a mention of that.
The other big but was the feeder tube harness was a joke.  When the spray arm rotated, it would slightly tap the harness-over time and high temps, this will most certainly cause a separation in the sprayer arm.  I tried everything short of filing down that mold, for it not to tap/scrape.  And the length of the tube is exactly the same, but the new harness had to be placed on the very edge of the rack-not very secured into the rack- so I have to be very cautious when loading it into the rear water feeder.  So there are my gripes-if I had known about these things, I would've been better prepared or even splurged for another kit.
The good news is that the leak has completely stopped.  I still have to wait and see if it cleans well. Now off to file that harness down just a bit and keep my fingers crossed that this will last a while.