Ordered mine today
Those brushes will seat nicely in a short amount of time. The pump will also get quieter....though I don't know if we will be able to tell it over the water noise. The amperage will also increase and with a DC motor -so will the RPMs and the GPH. Small high-frequency line noise should also decrease as the brushes seat.
BTW, I used to seat R/C car brushes by running the motors in a glass of water. The water put a nice load on the motor, kept everything cool which prolongs the life of the magnets, and washed out the dust from the housing.