Cast Iron

So my wife lived in Waco 15 years ago and bought a cheapo enameled DO at the grocery store. Her mom liked it and bought herself one there too. Two years later, the enamel on her mother's was cracked and peeling. Wife bought her a replacement. Two years later, same thing. Meanwhile, the original one my wife bought has been the workhorse of her kitchen for 15 years and the only chips it has are exterior ones from damage during cross country moves. I've often wondered if that company's quality control sucked and we just got lucky or if my MIL was that hard on them.