Why would anyone join such a church?

There are many reasons for this, but may I offer a few?

First, this Church was restored in our day by Jesus Christ Himself. Here you will find the authority to act in His name—to baptize for the remission of sins, to confer the gift of the Holy Ghost, and to seal on earth and in heaven.

Those who join this Church love the Savior Jesus Christ and they wish to follow Him. They rejoice in the knowledge that God speaks to mankind again. When they receive sacred priesthood ordinances and make covenants with God, they can feel His power in their lives. When they enter the holy temple, they sense they are in His presence. When they read the holy scriptures and live the teachings of His prophets, they grow closer to the Savior they love so much.