I think if the magnet sticks you are ok. when we switched, all our skillets worked because they were my grandmothers cast iron. Our collection of pots and pans was an oddball mix of cheap stuff. It was a great opportunity to thin the herd to a 1qt, a 2qt with steamer basket and a 6qt multi pot with pasta and steamer basket. And we kept grandmas dutch oven. The smaller pots are all-clad. The big one is Viking. I insisted that no pans be non-stick. I want to be able to scrub. The one exception is a pan just for cooking eggs.