This antiquated dinosaur design which still exists on the market today produces unnecessary drag in airflow which may potentially overheat your motor.
This makes the motor work harder and deliver less suction power over the course of time. This can also shorten the life of the motor.

It's totally unnecessary to have a central vacuum designed this way.

A dual canister system requires extra piping, additional storage, elbows and labor which is unneeded.

When additional elbows are used in this configuration you will lose a good percentage of suction power due to airflow restriction and more of a chance of clogging.

We're finding most of these systems are designed around an inefficient cyclonic design.

Here is something to ponder! Companies that give a longer warranty on their central vacuum unit, simply put, have more confidence in the quality of their product.
Typically most cyclonic units only offer a 5 to 7 year warranty - Better central vacuums offer a longer warranty... between 15 to 20 years to life time.