I haven't used the cookware a whole lot in the time that I have purchased them but I am already seeing spots/stains/discoloration in one of the smaller pans.
However, as per other reviews, this set works wonderfully on my flat top stove.
We purchased a house less than a year ago.  I am used to cooking on gas stove but the house came with a fairly new glass flat top electric stove.  The cookware that we previously used was rocking on the burners and seemed to take longer than usual to heat items up.  This cookware seems to heat things more efficiently and more quickly.