I give 4.5 stars, I would put 5 stars but it's quite noisy. I bought it for my house, we have a designer front door that we don't want to cover up with a screen door. So it arrived on time and the instructions were easy. Installation required 2 people and the magnetic switch was easy. Works great but a bit noisy for home use. At first I didn't think so, but my family immediately said it was noisy. After a few days I understood what they were talking about. While I don't have to turn on the TV when someone walks in the door, I'd like to do it if someone is waiting in front of the door for a long time. It has a nasal, hollow, metallic sound with a slight squeak when the engine revs up. I don't think this will be a problem for the business, in this case it's perfect. Overall I like it, it does what it promises and is not very loud. I would buy another one yes! but 1 was all I needed. PS The cable is short and too big!