I have the classic stainless steel all clad, not copper and not d4. Have had it about 15 years and it has held up great. Received most of it as wedding gifts. I also have the Kirkland (Costco) stainless set which is 95% as nice for a small fraction of the price.

I use barkeepers friend to keep them clean. My most commonly used pieces are large pot, large sauté, large saucepan with lids. The small frying pan is a waste.