I'm getting a new Amarr Lincoln 3138 (solid, insulated) garage door through Costco and was planning on the LiftMaster 6690L opener.

The installer who measured told me to skip LiftMaster and buy a Chamberlain from Home Depot instead, since it's the same company and he has seen them go as low as $100. He also offered to install it for free.

Is he right that LiftMaster isn't worth the extra money? Which Chamberlain model is the closest equivalent to the 6690L?