"The disadvantage is that it requires two food bags which weigh roughly the same, plus two ropes. This works better for a large amount of food, like for more than one camper."
There is another disadvantage to counterbalancing. If a bear goes to work on the hanging limb and starts shaking it, he can cause one bag to start sinking lower, to the point where it can be reached from the ground. This is not possible with the PCT method. As for a bear grabbing the rope in his mouth, use a thin slipppery rope, perhaps kevlar/spectra, and it will slip right thru his teeth. A thick rope will decrease the effectiveness of the PCT method for that reason. Different tools for different tasks. I have searched for, and never found, a documented case of a bear biting into/seizing the rope of a PCT hang and thereby gaining access to the food bag. If anyone can supply that documentation, I think this would be a great place to post it. There is a reason why most people who hang their food use the PCT method instead of the counterbalance method.