Product review (4 stars): Knobs do break easily
Bought two of these ranges for our building.  Much like the first reviewer, we found that, after 4 or 5 years, every knob is at least cracked on both ovens, with three being unusable. Gorilla glue added a month or two, but that's all we came up with.  It finally broke with the burner on full power.  I had to scramble to switch knobs with food over the burner to turn it off. Have yet to replace the knobs due to their ridiculous replacement cost.  Other than that, a great machine.