• Recently we had to replace a garage door opener and we are so happy with the model that we chose. We wanted an opener that didn't sound like it was tearing down the garage when you opened or closed the garage door. The Chamberlain 1/2 HP belt Drive Garage Door Opener answered our concerns. This unit is so quiet that we didn't think that it was working. We had to get used to the no jerking sound of the old one .While we appreciate the quietness of the opener, what is really important is the safety feature of the unit. You can delay the closing of the door for one, five or as much as ten minutes. Should the garage door need to be stopped the safety sensor stops the door from closing if contact is made with a person or object and it has a theft protection assurance that the door is locked once the door is closed, and it stays locked until you open it. Normally my do-it-yourself hubby does the installing but we decided to hire it done this time. It seemed only minutes and he said he had it programed and it was ready to be used. He commented that it was one of the easiest openers he had installed.