Product review (3 stars): Otherwise I hate the complete stove
Leave it to Jenn-Air to put plastic knobs on a stove.  Otherwise I hate the complete stove.  So far I have purchased two sets of knobs, and had to hire a service person to calibrate the ovens as to temperature regulation.  Plus my wife hates the black top because she constantly has to clean it.  It shows dirt and greased spatter profusely.