Product review (3 stars): It works, but is just as poor quality as the original.
If you are shopping for this part, you already know that the originals included with your expensive Jenn-Air stove are cheap pieces of plastic that don't hold up more than a few months.  This is exactly the same.  I've replaced all of my knobs more than once and expect to continue replacing.  Adding insult to injury is the fact that the shipping on these is more than the cost of the knob--and there is no shipping discount for ordering multiples, so I paid more than $20 for shipping about two ounces of cheap plastic in a padded envelope.  But since you have no alternative, go ahead and order them.