The unit voltage output is precise and correct: 9V, 500mA per 8 slots and 12V per two slots. It holds them all up loaded, keeping it all stable. Itself the unit is not noisy, works fine.
However, this unit is best for powering your child's toy railway or charging remote controlled toys. Because when at least one effect pedal is connected, it will generate such enormous noise to the speakers, that your sound operator will shut you down immediately. :-(
I returned the unit back and got T-Rex Fuel Tank Classic instead.