Lecture: Open list proportional representation system: The good, the bad and the ugly

The open-list proportional representation (OLPR) system, as opposed to the closed-list version, allows voters to pick their favourite candidate from the party list while retaining proportionality of the election results. In the Asia and the Pacific region, this system is used in among others; Fiji, Indonesia and Sri Lanka. What are the upsides, downsides and unintended consequences of this system?