Don't be fooled by that Amazon listing... I don't think that seller has anything to do with DSLR pros - they just put that in the description for SEO.
I wouldn't believe delivery quotes from anyplace that's not an authorized DJI dealer.
In theory, isn't the DJI gimbal going to be lighter and more accurate since it takes its cues from the Naza controller and not an external controller that's not at all connected to the actual flight of the Phantom?
Also, I would think that an outboard sensor's accelerometer would have a...