I have 2 Liftmaster chain driven openers. I can’t get the exact model number right now because it seems like their website is down but I’ll get it ASAP. I’m not particularly a fan of them because they are kind of noisy but they are only about 6 years old or so. They were put in when my house was built.
EDIT: They are Model 3255 1/2 HP Chain Drive Openers. They’re generally installed by contractors which wouldn’t surprise me because they were put in when the house was built.
http://www.liftmaster.com/consumerweb/pages/productmodeldetail.aspx?modelId=737