I got the copper core 10 piece set for Christmas and they are so wonderful to use!  Cleanup is easy - I just soak them a bit first and use a soft scrubber or cloth.  I accidentally scorched to frying pan when I first used it (heat was too high), and even that cleaned up easily with Bar Keeper’s Friend.  Only strange thing was that the set was missing the 3qt saucepan when it shipped from All Clad.  Customer Service was very nice, but it took a few calls and emails to actually get the replacement.  Ultimately, I got it though so I’m happy.  The 10 piece set is the perfect set to meet our needs.