Mine sucked at curbs. It worked, so probably "good enough". It was just annoying and I preferred to just carry my groceries before the baby and their strolle

Mine sucked at curbs. It worked, so probably "good enough". It was just annoying and I preferred to just carry my groceries before the baby and their stroller arrived. But if your grandma was handling stairs with hers, curbs likely wouldn't have been an issue.