Product review (3 stars): Great Stove but cheap knobs detract
We have had this stove for 3 months and are on our second set of knobs.  The littlest grease or hot oil from stove softens up the paint on the plastic knobs.
Ill probably try to get another set and paint them with clear poly. I have found other metal knobs (samsung electric range) that seem to fit but they cost $40 while the plastic knobs are $16.
Except for the cheap knobs the stove has worked great. Bosch does not admit to any defects when called and have no work around. I did have one agent mention they were looking at going to metal knobs in future so you may want to wait on your purchase until they do.