Product review (1 stars): Crapped out after three months.  These are not genuine Whirlpool--low quality
Update: 12/8/2015:  Now element is crapped out--I have to buy another one.  They used to last longer than just a few months.

It is always the right prong--when they used to be solid ends, did not happen as quickly, now they are cheaply made, and getting worse.

I think the right prong is either too short, or not wide enough--haven't figured out which, but it definitely is the right prong--the attachment to the frame also always breaks--could be a defect in basic design.  I had replaced the receptacle several times--it is like chicken and egg--once it starts pitting, don't know which came first--but probably the element, given that the receptacle is new.  So have been replacing both receptacle and element at same time.

Getting expensive replacing these every few months.  Changing rating to one star.

Update:  12/6/2015  Now a few months later, the right side prong is pitting, and sometimes does not come on, and I have to play with it.

Years ago, the prongs were solid, but now just a loop.  I wonder if some solder could be added, when the loop get pitted, it become thinner and eventually does not connect.

Now I have to buy another one after about three months.

>>>>

Worked well.  I was a bit apprehensive beforehand.  Much cheaper than buying from phyical dealer.