There are many benefits of converting to Islam. Some of them are:
One forms a personal and direct relationship with God by worshipping Him alone, without the need of intermediaries. One feels this personal relationship and is aware that God knows everything and is there to assist him/her.
A person realizes the true purpose of his or her life, which is to recognize God and follow His commandments.
A person is provided with a light, which guides him/her through life. The religion of Islam has answers to all situations, and one will always know the right steps to take in all aspects of life.
One finds true happiness, tranquility, and inner peace.
Upon converting to Islam, all of one’s previous sins are forgiven, and one starts a new life of piety and righteousness. And as a Muslim, when one makes a mistake thereafter, he/she can always repent to God who forgives the sins of those who repent to Him sincerely. There are no intermediaries or created beings to make confessions to.
One achieves salvation from Hellfire, which all prophets have warned against.
The greatest benefit is that a Muslim is promised by God the reward of eternal Paradise (Heaven). Those who are blessed with Paradise, will live eternally in bliss without any sort of sickness, pain or sadness. God will be pleased with them and they will be pleased with Him. Even the lowest in rank among the dwellers of Paradise will have ten times the like of this world, and they will have whatever they desire. In fact, in Paradise there are pleasures that no eye has ever seen, no ear has ever heard, and no mind has ever thought of. It will be a very real life, not spiritual only, but physical as well.