a friend gave me one. its a little noisy on start up when the prop slides in and out of the motor, but it stays on all the time in my tank so ive never complained. if i had a wave maker it probally would drive me nuts. as far as which model i have i dont know, its got a blue prop. and gph i dont know either, but it moves almost as much water as my aquaclear 70 powerhead. i have it mounted up close to the water level and never have i noticd it trying to suck air or even swrill the water around it. i would like to have the other color props to see the diffrence between em though.