It is mostly useful and safer for human legal professionals and experts since they have the expertise to check the output but risky and unsafe for those who have little to no legal knowledge.

A user who is a non-legal expert could get into serious trouble if the AI hallucinates output that is contradictory or harms them legally more than it helps them or even both. That is the evergreen risk.

Either way, someone will have to check over the AI's output for that risk and that is for legal human professionals to do, hence why those with no legal experience still trust human lawyers to pay them to check these legal documents.