"The Senate of the United States shall be composed of two Senators from each State, elected by the people thereof, for six years; and each Senator shall have one vote. The electors in each State shall have the qualifications requisite for electors of the most numerous branch of the State legislatures.
When vacancies happen in the representation of any State in the Senate, the executive authority of such State shall issue writs of election to fill such vacancies: Provided, That the legislature of any State may empower the executive thereof to make temporary appointments until the people fill the vacancies by election as the legislature may direct.
This amendment shall not be so construed as to affect the election or term of any Senator chosen before it becomes valid as part of the Constitution."
The seventeenth amendment changed the choosing of Senators to the people of states rather than state legislatures. This granted individuals more power.
History of Senatorial Votes
This document explains in a detailed manner why electing senators by popular vote is to the people's advantage and how the seventeenth amendment was brought about. This is written in favor of the amendment being passed.
This video provides insight to why the seventeenth amendment is to the people's disadvantage. By reverting to old methods, the repeal would reduce the power of the federal government by empowering state legislatures to elect senators.