I buy them all the time. Well worth it for things where the tomato sauce is a dominant flavor. I make huge batches of Marinara and Bolognese sauces and freeze them for quick week night dinners and wouldn't use any other canned tomato for those. If I'm making a stew or soup, where tomato is secondary and part of a ton of ingredients, I don't use them. We also cook a lot of Indian and I don't use San Marzanos for that - only Italian.