Main Advantages

Every aspect of it is lawful. It is guaranteed by the U.S. Constitution, Supreme Court and other court decisions.
It is easy to establish, can be maintained by you and involves minimal paperwork. It greatly reduces or eliminates fees.
It is lawful in every state. A Spendthrift Trust properly established in one state can operate in any other state.
It is made irrevocable to avoid any questions as to ownership of the assets.
It prevents any information about your assets, liabilities and heirs from becoming public.