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Message: <blockquote data-quote="Dave70968" data-source="post: 1341528" data-attributes="member: 13624">I'm very happy with my Chamberlain.  I have the model with the battery backup, which was nice the day the power went out.  Very quiet, and works every time.A word of caution: be sure the optical beam sensors are aligned.  I went through a couple of weeks when the door would start moving down, then stop.  I couldn't figure out what was wrong until I realized the sensors were no longer aligned.  Not a Chamberlain failure, more of a dummy Dave the installer failure.  Don't make the same mistake.</blockquote>