My 16 year old sears craftsman chain drive opener is still going strong for a 16 foot door. Forget if it is 1/2 or 3/4 horse. Had more trouble with the door. Replacing a spring on one side and some rollers a few years ago and replaced some more rollers a couple weeks ago. Opener wouldn't work after a lightning strike this spring but ended up unplugging it to dispell the static electricity and then it worked again. Bought some new remotes though. Original ones work but not as well. Don't know much about the others.