I bought an LG glass top range and was very disappointed at how easily the top was to scuff/scratch and how hard it was to keep clean it shows every thing from dirt and grease to hard water spots. 
Despite all this I called the customer support line for assistance or see what my options may be as my wife was not happy with this purchase at all. After getting to the presidential liaison our issues led to getting the top replaced within 2 days. Was ultimately satisfied with the service but not so much the product exactly.