I have those pots from Rocky Mountain and they are the bargain of the century! excellent in every way. As the bottoms are hammered and not fully flat, these are best for gas ranges.
My mom and I have had our Revere pots/pans for 20+ years .. still going great.I would agree. Copper is very ductile, and I would expect that it would stretch and shrink with the SS lining. Revere once made a sort of a hybrid line, copper and stainless, about half and half, and I have never heard of those delaminating. They must have sold millions.