It is for a 7-08. My only hang up is, the VX2 has a 40,, objective, so in theory it should be a bit better in low light.
Theoretically speaking, I think that is incorrect. The size of the exit pupil is what dictates which will be brighter(assuming all things glass, and coatings, are equal).
Exit pupil is derived by taking the objective size, and dividing it by power.
So a 3x9x40, set at its highest power would have an exit pupil of just under 4 and a half mms (40 divided by 9).
A 2.5x8x36 would have an exit pupil of 4.5 (36 divided by 8). So theoretically speaking, the 2.5x8 would be the brighter scope.
