In this article, a comprehensive review of quadratic buck-boost converters has been presented. Due to the wide conversion ratio, these converters are suitable for intermittent renewable sources like PV systems for power generation. This article aims to compare the quadratic buck-boost converters in terms of structural difference, the total electric stress experienced by power semiconductor devices, efficiency, and few other features. Further, the reliability of these converters is estimated with the help of the Markov chain model, and converters are compared with a mean time to failure period. Finally, the merits and demerits of each converter are explained.