The PRIMARY benefit of using a maturity model is that it helps to evaluate the:

A maturity model is a framework that describes the stages or levels of development and improvement of a certain domain, such as a process, a function, or an organization. A maturitymodel can help to evaluate the current state, identify the strengths and weaknesses, set the goals and objectives, and measure the performance and improvement over time. The primary benefit of using a maturity model is that it helps to evaluate the evolution of process improvements, meaning that it can help to track the progress andchanges of the processes, as well as to identify the best practices and standards. A maturity model can also help to compare the processes with the industry benchmarks and competitors, as well as to align the processes with the business strategy and vision. References = Risk and Information Systems Control Study Manual, Chapter 3, Section 3.3.2.1, p. 118-119