Here is a review left by a customer on a product. Would you say he was satisfied or dissatisfied?
Title: Hopefully will never need to know how well they work
Review: Read a lot of information on Photoelectric sensor smoke detectors and decided to invest in safety. These are supposed to be superior for detecting smoke, which is what is really more harmful in a fire than flames. I'm hoping I never find out how well they work! Easy to install and great for peace of mind. I did not remove my other builder grade smoke detectors, I added these to all the stairwells. Some of the other reviews mentioned needing to be replaced in two - three years, I'm ok with that, small price to pay for safety. These appear to be sturdy and well made.
