Bought as part of LG suite for kitchen remodel. It replaced a 30 year old glass cooktop with knobs that was not too reliable.  I've only used this LG a few times. It heats quicker than old one. Cleanup is better without knobs in the way. Owners manual and quick guide were fairly easy to comprehend. Recommended heat settings for various cooking will require some trial and error, but I think you should start out at a lower setting than those shown. I don't get all the speckles embedded in the surface.