I'm thinking of purchasing either the Wolfgang Puck Cookware line or the Sitram Profiserie line from Costco. Both is of similar value and I am curious of people who may own the Wolfgang Puck's line. Any advice? Even cooking surface? Easy to clean? Food sticks often or not? Glass Lid considerations? Discoloration of cookware from Cooking? Thanks.. I shall post a report on my experience once I decide on which cookware to buy.