Product review (3 stars): Good cooktop/knobs are junk
Boils water very fast, grates are not to high and griddle works fine. Grates and griddle are heavy duty. Stainless finish scratches easily and is not super high quality, but adequate. To date, no issues with plastic knobs, but they seem somewhat flimsy.
Over all, it's a good cooktop, not super high end, but looks nice and cooks great.
We like it and would buy it again.

Update........
Plastic knob already broken. We've been gentle, no rough use or abuse. Typical GE quality, cheaply made.