I would love to have one.
Some gardeners find the flowers messy.
Mimosas don't need special care. They quickly grow to about 30 feet, given sun and a well-draining soil. The wood, however, tends to be brittle, it is subject to beetle damage and webworms, and these trees have a reputation of being short-lived. Mimosa wilt can be a problem, too. Mimosas are self-seeders.