Product review (2 stars): DO NOT BUY. Main burner broke at 14 months. Out of warranty at 12 months.
DO NOT BUY.
I bought this Aug 2015 based on many reviews and really regret it. The central (main) burner has stopped working.
It became very stiff to operate (the actual shaft that controls gas flow) and the control knob broke.
The warranty is for only one year so it is out of warranty - by 6 weeks.
I'm beyond disappointed that an appliance that costs as much as it does did not last much past a year - in fact 6 weeks past the warranty expiration!
The 'service' call will be expensive just to get someone out ($100).  Parts and labor are extra.
I'll be communicating this to others.

UPDATE: after multiple calls and escalations (online, written, multiple phone calls) I finally made an appointment for a service call as GE was not willing to repair it 'out of warranty' under any circumstances. Technician came and diagnosed one burner control shaft as missing a component and broken and several other knobs as broken. The broken knob left fragments in the hole that prevented the shaft turning properly. He did not charge for ordering a new set of knobs nor the missing component. They arrived a couple of days later. He did not charge for the service appointment.  I'm happy with the service but still feel it was not needed. I also suspect that I'll be needing knobs multiple times over the lifetime of this cook-top. ADDING one star for decent service.