This is the 5 ply copper core set that I own and love. It's not my first set of Costco, Kirkland brand 5 ply stainless cookware though. I purchased a set in 1997 and loved and used that set until 2017. It was in fantastic condition even then, and probably still is, the only problem being it was strewn all over South Texas by hurricane Harvey (no relation to Shelly).
In 1992 I was commercial fishing in the Bering Sea. I was making good money and decided to treat myself to a set of All Clad cookware. I believe it was an 8 piece set, and if memory serves I paid about $1,200. I did love that cookware! But when I moved from San Francisco back to Alaska in 1994, I sold the set to my roommate, who also loved them.
3 years later, seeing the set at Costco for under $200, I thought they would be no match for the All Clad, but my wallet wasn't as flush at that time. As it turned out I thought they were as good as the All Clad, still do. But this new set is even better, with the copper core. And pretty sexy looking if I do say so.
I can't recommend this set of Cookware enough, and there is absolutely a cult following from many chefs across the country.
Oh yeah, 25 years later, and with a copper core, still under $200!