The use of embargo and sanctions coupled with pain-staking talks have resulted in the Iran nuclear deal and the world is a much better and safer place. Now the process of rebuilding and reinforcing relationship has begun. Iran is open for business and this will be of tremendous benefit for 80 million Iranians, most of whom were born after the 1979 Revolution.
The United Nations Security Council has by a 15-0 vote accepted the agreement; the Supreme Ayatollah Khamenei has muted his criticism; the Saudis have seen the light and muted their opposition, but the Republican Congress led by Boehner and McConnell have mounted an attack, supported by the "friends' of Netanyahu...AIPAC, and gambling billionaire Adelson. The Israeli ambassador, in desperation has met with the Congressional Black Caucus but here, he is dealing with some of the most loyal Americans, who know a good deal when they see one and like African Americans from the Civil War to Vietnam, Iraq and Afghanistan serve their country first, unlike others, who because of religion or other attachment put America second. Jewish members of Congress, such as Schumer ( who wants to e the next Democrat leader) and Schiff have been under a lot of pressure to vote against the "deal". Time will tell. Even if Congress vote to kill the "deal'', President Obama has veto power and he will use it and will not be overridden.
The benefits of the agreement are many. Trade will benefit. Consumers of oil and gas will benefit. Farmers and manufacturers will benefit; the region will benefit, as the fight with ISIL will be more concentrated. Iran will help with Iraq(IS) , Syria (IS), Yemen ( Houthis), and Afghanistan ( Al Qaeda and drug trade) and with Hizballah in Lebanon. The Saudis leading the Sunnis are concerned about the growing power of Shia Iran, but he Iranian nuclear programme has been put on hold for 10-15 years and so that fear is limited ( if the agreement had not been signed, then Iran would have been full speed ahead).
Netanyahu of Israel continues to rail against the agreement and hopes to use the Israeli lobby and friends to derail it, but like his speech to Congress, it will fail. Israel has nuclear weapons and the Americans will offer military and economic incentives to them and Netanyahu knows this and will shout even louder to get more and more from the Americans.