But the generally peaceful nature of the election, and the fact that Koroma is stepping down while other African presidents seek to extend their mandates, is seen as a positive sign for Sierra Leone that was ripped apart by a 1990s civil war made infamous by the use of child soldiers.
Voters are casting their ballots for either the ruling APC's presidential candidate Dr. Samura Matthew Wilson Kamara or the Sierra Leone People's Party presidential candidate Julius Maada Bio.
"The race is too close to call", Edmond Abu, director of the Native Consortium and Research Center, told AFP on Friday.
The election was shifted from Tuesday to Saturday after a complaint about fraud in the first round of voting this month from a member of Kamara's All People's Congress.
President Ernest Bai Koroma is leaving office after serving two five-year terms, the constitutional limit, but inundated with claims of corruption and mismanagement from the opposition.
The High Court resolved the issue Monday, but the National Election Commission asked the court for four more days to prepare the election.
The former military man was part of a coup in 1992, and briefly led a junta in 1996 that eventually paved the way for democratic elections.
Kamara ran on a platform of continuing the APC's track record of infrastructure development.
But the campaign has been characterised by ugly verbal exchanges and occasional violence.
Sierra Leone, rich in minerals, was a British colony from 1787 until 1961.
It killed almost 4,000 people yet there are still only 200 doctors serving the country of seven million people.
Voting process started at 0700 GMT but the voters have been coming in in trickles, a departure from the 80 percent voter turnout recorded during the first round.