Product review (3 stars): not sure, but seems identical to the one I replaced.
I purchased this because my CRUMMY Whirlpool shelves were cracking like crazy.  Several shelves, in several places.  I am VERY unhappy with my Whirlpool shelves.  I did not unreasonably overload them and they were not very old.  Two or three years.  Unlike the other reviewers..... this shelf does not seem like a different brand or sturdier than the original to me.  It seems identical to the one I replaced quite frankly.  At the risk of having to replace yet another $80 shelf, or worse, having a catastrophic collapse in my refrigerator at 2 am, I reinforced the weak points underneath this new shelf with white Marine Tex (molds like epoxy, hardens like steel, sands like wood).  I'm happy to say I'm now enjoying what seems like a pretty sturdy shelf.  It doesn't deflect when I place a gallon of milk on it anymore.