Yeah, we’ve tested out the System Sensor 2351B, and it’s been a noticeable upgrade from the 2251B. One significant improvement is its enhanced sensitivity to smoke particles, which ensures quicker detection of fires. Additionally, the 2351B offers improved reliability and durability, making it a more dependable option for fire alarm systems. Overall, it’s a solid choice for replacing the 2251B and improving the effectiveness of your fire detection system.