As a technician at firealarm.com, I’ve had the opportunity to work with the SDi SOLOA10 extensively since its release. It’s a significant improvement over the Trutest Smoke 400 in various aspects. Firstly, the SOLOA10 offers more advanced features, including enhanced sensitivity adjustment options and improved reliability in detecting smoke. Additionally, its installation process is smoother and more intuitive, which saves time and effort for technicians. Overall, I highly recommend considering the SDi SOLOA10 for your fire alarm system needs.