Too bad, the VND filters from PGYTech are going to be returned.
The color shift was too much for me to be useful (without quite a bit of post processing).
Since it was different depending on the angle of the light, it would be very hard to automate this.
(and that defeats the purpose of why I got a P2 in the first place.
This is a DNG output from P2 with the 6-9 filter set to 9 (the effect is most visible at max density).
It looks 'ok' but you can see the color shifting in the corners (getting more blue)
I have the same VND 2-5 stops filter and has a blue color shift in the upper right and lower-left corner, and if I point to the sky, it will look like I used the polarizer filter and it looks awful.