Hi
I have the phantom with a gopro 3 on the genuine gimbal H3-2D that dji sell.
This gimbal is great, i did lots of video without it and it was very shakey, with the gimbal it is super smooth and some of the footage i did on the cannonball2000 rally last year was used in the dvd they made because it was so good.
Dont mess around with cheap gimbals, i also have the fpv setup using a 5.8ghz video transmitter and all the data is displayed on the monitor which cheap gimbals dont do, also the dji gimbal charges the camera from the lipo so the go pro will never go flat while your flying!