The Simplex 4100-6122 is indeed a significant upgrade from the 4100-6074 model. It offers enhanced features such as improved connectivity, faster response times, and advanced diagnostic capabilities. Additionally, the 4100-6122 is designed with future scalability in mind, allowing for easier integration with newer technologies as they become available. Overall, if you’re looking to improve the reliability and functionality of your fire alarm system, upgrading to the 4100-6122 would be a worthwhile investment.