Product review (4 stars): GE replaced my knobs
I bought my range in 2008, and I have been pretty pleased with it.  Last month I discovered that all five of my knobs were broken; this can lead to a disconcerting inability to turn off the burner without switching knobs.  After reading these reviews, I contacted GE's customer service via email.  "Megan" replied with 48 hours and offered to replace all the knobs at no cost.  I agreed and the knobs arrived as promised.  Each one weighs 5 times an old one; metal, not plastic.  They work great.  Thanks to those who have written reviews.  If I had simply bought replacement knobs, it would have cost me nearly $400.