Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Love it but............

I purchased the 12 piece set after months of reading reviews. I really wanted All Clad but who can afford it, I wanted a once and forever set of cookware to last me my remaining days, I am a 64 year old wannabe cook. I love the set, everything that I have cooked has turned out great and have ordered additional pieces. Clean up is super and whatever doesn't come clean, Barkeepers Friend takes care of. One problem has come up. I have only used my 8 quart stock 4 times. Light colored spots have appeared on the bottom of the inside, I have tried to clean them with Barkeepers but that doesn't do anything. Is it possible that the stainless steel layer is coming off and I am seeing the aluminum core. If so is this going to cause problems with acid foods like tomato sauces?