Joe, you can have bad AO front objective scopes too, when you turn the front POI will move on a bad unit. just like when you reparallax a fixed front objective scope, POI will certainly move.
Also i would add that if you place the camera at maximum magnification into the sweetspot/'focus', you will not have to move the camera around at lower mags.
long eye relief scope are nice but i am wondering what is the price to pay for this feature... i dont mean $. probably they suffer awfully from parallax error at short ranges?