In my experience with two central systems (one will be 10 and the other now 20 years old) they had much longer heavier hoses than a regular vacuum. I found them unpleasant to use as did several housekeepers. I think they are the most effective at removing dust and dirt from the environment as I said before and if you love yours that is great, but my gripe is a common complaint of these systems.
But they did not have a cord to deal with. They do not need to be emptied. The actual act of vacuuming is easier and more efficient as you're not moving the engine around nor do you have to empty a canister all the time.