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It sure is nice to have the luxury of hitting a button and the garage door opens up... No more having to clean & jerk the door open during bad weather. Garage door openers all serve the same purpose, but their methods sometimes differ.
On the low end of the price spectrum is the chain drive system. This resembles the old bicycle chain and it works well, but it is noisy. So when you are in the living room you can hear the "hum" of the chain drive operating the door. The chain drive is also a chore to install. You have to uncoil it and wrap it around the sprocket, getting your hands greasy in the process.
The next step up is the screw drive opener. These assemble easier and faster than the chain drive units, with each end screw section secured together to form the length of the rail. These are only slightly more expensive than the chain drive units, and they don't seem to have the vibration and subsequent noise that the chain drive's have.
Finally, there are the belt driven models. These run the quietest of all the styles and install very easily. The belt slips over the sprocket and is tensioned with a mechanism that makes quick work of the process.
My choice would be the belt driven model, because it really doesn't cost much more than the less expensive units, and over the life of the unit I don't have to worry about being awakened when someone opens the door late at night.
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