They almost always fall apart if the motor's never been out.
My brother and I pulled the motor out of his truck last weekend and you could hear the mounts creaking as we lifted the engine.
I thought maybe we missed a bolt on the mounts somewhere, and when we looked down at the motor mount on the drivers side, you could see the rubber part of the mount being stretched from the strain of the pull from the cherry picker.
Then it split and let go with a snap sound. It was welded like the back half of a stock supra driveshaft (sadly the rubber bonding in the drive shafts don't seem to hold as well).