I used it for a while, but I noticed when you move your head the terrain blursm, in AHI and AHII, which was giving me motion sickness after a while.
It doesn't happen in IL2, the images don't seem to blurr when I move my head.
It is awsome otherwise. Once I am in gun range I click it off and us my hat switch. I mainly used it when going from fight to fight. Saved my hat switch and was easier to look around for a fight.