Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Easy to install, works well, not quiet at all

I purchased this opener for use on a double door. The unit was easy to install, easy to align, and the remotes and keyless entry are nice features. However, I am quite disappointed that the unit is extremely noisy. This replaced a chain drive unit that was noticeably quieter than the "whisperdrive" unit. The noise level of the door itself is not the issue, the noise that is infuriating is coming from the drive unit itself. Based on my experience I wouldn't pay the premium price for a Chamberlain unit in the future.