I have been having trouble for months with my garage door opening and closing. A friend mentioned could be sensors. So I purchased, and they work perfectly and solved my door not closing problem!
Ordered a gear kit to fix my garage opener, as the top sprocket had broken off. The item shipped quickly and was packaged well. Installation instructions were informative but I did not end up following them very closely. The part itself looked to be of OEM quality, if not better, and is holding up well so far (2 weeks after the install).
I had a LiftMaster garage door opener system that was obsolete. It was a chain driven AC motor system. It has been a reliable door opener. The remote control failed on the unit. I could still open and close the door with the manual control inside the garage. I decided to buy a new opener since the one I had was obsolete and I didn't want to invest in the cost of repair of the old unit. After installation, I operated the new belt driven DC motor unit and was extremely pleased. This new opener is 10 times quieter than the old chain driven system. I am a happy customer and would recommend this unit to anyone in the market for a garage door opener.