We had a vacation house with a central vac system. As mentioned the hose is a pain in the ***. You've got to have multiple outlets per level-our place was 2 stories and a basement with the vac motor in the basement-or drag around an un Godly amount of hose. It is quieter, depending on where you install the motor. It will keep dust from blowing back into the house as you vacuum, again depending on where you install it. The afore mentioned hose was a major draw back imo. Another thing not mentioned is it is possible to plug up the line, not the hose part, and that can be a royal pain in the ***.
FWIW, I would just roll with a conventional vacuum cleaner. And if you can afford it, some fine little ho in a French maid outfit to push it around.