The polarizers in the six pack are pretty weak. I bought a set thinking it would help shooting on water, just like a 'real' camera. Doesn't. You can barely tell the difference as you rotate the drone. And recall that, even if they did work well, the polarization factor would change as you move the camera relative to the sun. In my case, I was trying to shoot some fish almost vertically and pretty much stationary. Still could not punch through much of the glare.
the N32 is useful on those nice bright days.
Yeah the concept of a CP on a Phantom is interesting to me considering you can't rotate while in flight. I guess it could be used if you set it beforehand and plan on getting a still photo at a particular angle.
Have you found any polarizers that do actually work for video? Also, have you found much of a difference between say the ND-16 and the ND-16 PL? Is using the the polarized version going to make the shot worse or do you pretty much get the same result?